21007185023 has 8 divisors (see below), whose sum is σ = 24123083520. Its totient is φ = 18092312280.

The previous prime is 21007184969. The next prime is 21007185053. The reversal of 21007185023 is 32058170012.

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

It is a cyclic number.

It is not a de Polignac number, because 21007185023 - 2⁶ = 21007184959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21007185053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50256215 + ... + 50256632.

It is an arithmetic number, because the mean of its divisors is an integer number (3015385440).

Almost surely, 2^21007185023 is an apocalyptic number.

21007185023 is a deficient number, since it is larger than the sum of its proper divisors (3115898497).

21007185023 is a wasteful number, since it uses less digits than its factorization.

21007185023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100512877.

The product of its (nonzero) digits is 3360, while the sum is 29.

The spelling of 21007185023 in words is "twenty-one billion, seven million, one hundred eighty-five thousand, twenty-three".