21123521301 has 32 divisors (see below), whose sum is σ = 29797488000. Its totient is φ = 13273666560.

The previous prime is 21123521299. The next prime is 21123521329. The reversal of 21123521301 is 10312532112.

It is not a de Polignac number, because 21123521301 - 2¹ = 21123521299 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123521401) 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 31 ways as a sum of consecutive naturals, for example, 12273121 + ... + 12274841.

It is an arithmetic number, because the mean of its divisors is an integer number (931171500).

Almost surely, 2^21123521301 is an apocalyptic number.

It is an amenable number.

21123521301 is a deficient number, since it is larger than the sum of its proper divisors (8673966699).

21123521301 is a wasteful number, since it uses less digits than its factorization.

21123521301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709.

The product of its (nonzero) digits is 360, while the sum is 21.

The spelling of 21123521301 in words is "twenty-one billion, one hundred twenty-three million, five hundred twenty-one thousand, three hundred one".