921320852520 has 32 divisors (see below), whose sum is σ = 2763962557920. Its totient is φ = 245685560640.

The previous prime is 921320852479. The next prime is 921320852521. The reversal of 921320852520 is 25258023129.

It is a super-2 number, since 2×921320852520² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (921320852521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3838836766 + ... + 3838837005.

It is an arithmetic number, because the mean of its divisors is an integer number (86373829935).

Almost surely, 2^921320852520 is an apocalyptic number.

It is an amenable number.

921320852520 is an abundant number, since it is smaller than the sum of its proper divisors (1842641705400).

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

921320852520 is a wasteful number, since it uses less digits than its factorization.

921320852520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7677673785 (or 7677673781 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

Adding to 921320852520 its reverse (25258023129), we get a palindrome (946578875649).

The spelling of 921320852520 in words is "nine hundred twenty-one billion, three hundred twenty million, eight hundred fifty-two thousand, five hundred twenty".