1331210220 has 24 divisors (see below), whose sum is σ = 3727388784. Its totient is φ = 354989376.

The previous prime is 1331210197. The next prime is 1331210239. The reversal of 1331210220 is 220121331.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1331210220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11093359 + ... + 11093478.

It is an arithmetic number, because the mean of its divisors is an integer number (155307866).

Almost surely, 2^1331210220 is an apocalyptic number.

1331210220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331210220 is an abundant number, since it is smaller than the sum of its proper divisors (2396178564).

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

1331210220 is a wasteful number, since it uses less digits than its factorization.

1331210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22186849 (or 22186847 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1331210220 is about 36485.7536581061. The cubic root of 1331210220 is about 1100.0579087971.

Adding to 1331210220 its reverse (220121331), we get a palindrome (1551331551).

Subtracting from 1331210220 its reverse (220121331), we obtain a square (1111088889 = 33333²).

It can be divided in two parts, 13312 and 10220, that added together give a palindrome (23532).

The spelling of 1331210220 in words is "one billion, three hundred thirty-one million, two hundred ten thousand, two hundred twenty".