21013000123199 has 32 divisors (see below), whose sum is σ = 24562847116800. Its totient is φ = 17603847152640.

The previous prime is 21013000123169. The next prime is 21013000123201. The reversal of 21013000123199 is 99132100031012.

It is a happy number.

It is not a de Polignac number, because 21013000123199 - 2³⁶ = 20944280646463 is a prime.

It is a super-2 number, since 2×21013000123199² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013000123169) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85015307 + ... + 85262115.

It is an arithmetic number, because the mean of its divisors is an integer number (767588972400).

Almost surely, 2^{21013000123199} is an apocalyptic number.

21013000123199 is a deficient number, since it is larger than the sum of its proper divisors (3549846993601).

21013000123199 is a wasteful number, since it uses less digits than its factorization.

21013000123199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248063.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 21013000123199 in words is "twenty-one trillion, thirteen billion, one hundred twenty-three thousand, one hundred ninety-nine".