20521032511 has 16 divisors (see below), whose sum is σ = 24220753920. Its totient is φ = 17021759040.

The previous prime is 20521032451. The next prime is 20521032523. The reversal of 20521032511 is 11523012502.

It is a cyclic number.

It is not a de Polignac number, because 20521032511 - 2²⁵ = 20487478079 is a prime.

It is a super-2 number, since 2×20521032511² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20521036511) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 321135 + ... + 379696.

It is an arithmetic number, because the mean of its divisors is an integer number (1513797120).

Almost surely, 2^20521032511 is an apocalyptic number.

20521032511 is a deficient number, since it is larger than the sum of its proper divisors (3699721409).

20521032511 is an equidigital number, since it uses as much as digits as its factorization.

20521032511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700974.

The product of its (nonzero) digits is 600, while the sum is 22.

The spelling of 20521032511 in words is "twenty billion, five hundred twenty-one million, thirty-two thousand, five hundred eleven".