21213365036523 has 16 divisors (see below), whose sum is σ = 31919796921600. Its totient is φ = 12413254357280.

The previous prime is 21213365036509. The next prime is 21213365036593. The reversal of 21213365036523 is 32563056331212.

It is a cyclic number.

It is not a de Polignac number, because 21213365036523 - 2⁵ = 21213365036491 is a prime.

It is a super-2 number, since 2×21213365036523² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21213365036593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11083261863 + ... + 11083263776.

It is an arithmetic number, because the mean of its divisors is an integer number (1994987307600).

Almost surely, 2^{21213365036523} is an apocalyptic number.

21213365036523 is a deficient number, since it is larger than the sum of its proper divisors (10706431885077).

21213365036523 is a wasteful number, since it uses less digits than its factorization.

21213365036523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22166525682.

The product of its (nonzero) digits is 583200, while the sum is 42.

The spelling of 21213365036523 in words is "twenty-one trillion, two hundred thirteen billion, three hundred sixty-five million, thirty-six thousand, five hundred twenty-three".