21052518711 has 24 divisors (see below), whose sum is σ = 32665651200. Its totient is φ = 12025307952.

The previous prime is 21052518653. The next prime is 21052518713. The reversal of 21052518711 is 11781525012.

It is not a de Polignac number, because 21052518711 - 2¹⁰ = 21052517687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052518713) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 368340 + ... + 421638.

It is an arithmetic number, because the mean of its divisors is an integer number (1361068800).

Almost surely, 2^21052518711 is an apocalyptic number.

21052518711 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21052518711 is a deficient number, since it is larger than the sum of its proper divisors (11613132489).

21052518711 is a wasteful number, since it uses less digits than its factorization.

21052518711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56003 (or 55996 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 33.

The spelling of 21052518711 in words is "twenty-one billion, fifty-two million, five hundred eighteen thousand, seven hundred eleven".