1021124220 has 192 divisors, whose sum is σ = 3166732800. Its totient is φ = 244823040.

The previous prime is 1021124197. The next prime is 1021124231. The reversal of 1021124220 is 224211201.

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 1021124220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2214790 + ... + 2215250.

It is an arithmetic number, because the mean of its divisors is an integer number (16493400).

Almost surely, 2^1021124220 is an apocalyptic number.

1021124220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021124220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1583366400).

1021124220 is an abundant number, since it is smaller than the sum of its proper divisors (2145608580).

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

1021124220 is a wasteful number, since it uses less digits than its factorization.

1021124220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588 (or 586 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1021124220 is about 31955.0343451544. The cubic root of 1021124220 is about 1006.9923990608.

Adding to 1021124220 its reverse (224211201), we get a palindrome (1245335421).

The spelling of 1021124220 in words is "one billion, twenty-one million, one hundred twenty-four thousand, two hundred twenty".