10521039921 has 32 divisors (see below), whose sum is σ = 16422236160. Its totient is φ = 5866003584.

The previous prime is 10521039899. The next prime is 10521039941. The reversal of 10521039921 is 12993012501.

It is not a de Polignac number, because 10521039921 - 2⁶ = 10521039857 is a prime.

It is a super-2 number, since 2×10521039921² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10521039941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 927160 + ... + 938438.

It is an arithmetic number, because the mean of its divisors is an integer number (513194880).

Almost surely, 2^10521039921 is an apocalyptic number.

It is an amenable number.

10521039921 is a deficient number, since it is larger than the sum of its proper divisors (5901196239).

10521039921 is a wasteful number, since it uses less digits than its factorization.

10521039921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12365.

The product of its (nonzero) digits is 4860, while the sum is 33.

The spelling of 10521039921 in words is "ten billion, five hundred twenty-one million, thirty-nine thousand, nine hundred twenty-one".