21013525211 has 8 divisors (see below), whose sum is σ = 24019503360. Its totient is φ = 18008558568.

The previous prime is 21013525129. The next prime is 21013525229. The reversal of 21013525211 is 11252531012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21013525211 - 2¹⁸ = 21013263067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013525231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207821 + ... + 291918.

It is an arithmetic number, because the mean of its divisors is an integer number (3002437920).

Almost surely, 2^21013525211 is an apocalyptic number.

21013525211 is a deficient number, since it is larger than the sum of its proper divisors (3005978149).

21013525211 is an equidigital number, since it uses as much as digits as its factorization.

21013525211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505753.

The product of its (nonzero) digits is 600, while the sum is 23.

The spelling of 21013525211 in words is "twenty-one billion, thirteen million, five hundred twenty-five thousand, two hundred eleven".