10521491920 has 40 divisors (see below), whose sum is σ = 24467190696. Its totient is φ = 4207784448.

The previous prime is 10521491881. The next prime is 10521491951. The reversal of 10521491920 is 2919412501.

It can be written as a sum of positive squares in 4 ways, for example, as 1570061376 + 8951430544 = 39624^2 + 94612^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×10521491920² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 571174 + ... + 589306.

Almost surely, 2^10521491920 is an apocalyptic number.

10521491920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10521491920 is an abundant number, since it is smaller than the sum of its proper divisors (13945698776).

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

10521491920 is a wasteful number, since it uses less digits than its factorization.

10521491920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25399 (or 25393 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 10521491920 in words is "ten billion, five hundred twenty-one million, four hundred ninety-one thousand, nine hundred twenty".