1250221520 has 20 divisors (see below), whose sum is σ = 2906765220. Its totient is φ = 500088576.

The previous prime is 1250221513. The next prime is 1250221529. The reversal of 1250221520 is 251220521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 797723536 + 452497984 = 28244^2 + 21272^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1250221520² = 3126107698142220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1250221492 and 1250221501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1250221529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7813805 + ... + 7813964.

It is an arithmetic number, because the mean of its divisors is an integer number (145338261).

Almost surely, 2^1250221520 is an apocalyptic number.

1250221520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1250221520 is an abundant number, since it is smaller than the sum of its proper divisors (1656543700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1250221520 is a wasteful number, since it uses less digits than its factorization.

1250221520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15627782 (or 15627776 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1250221520 is about 35358.4716864290. The cubic root of 1250221520 is about 1077.2809746404.

Subtracting from 1250221520 its reverse (251220521), we obtain a palindrome (999000999).

The spelling of 1250221520 in words is "one billion, two hundred fifty million, two hundred twenty-one thousand, five hundred twenty".