21023361099 has 24 divisors (see below), whose sum is σ = 32745672960. Its totient is φ = 12920573952.

The previous prime is 21023361089. The next prime is 21023361119. The reversal of 21023361099 is 99016332012.

It is a happy number.

21023361099 is a `hidden beast` number, since 2 + 1 + 0 + 2 + 33 + 610 + 9 + 9 = 666.

It is not a de Polignac number, because 21023361099 - 2²⁴ = 21006583883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21023361019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26859 + ... + 206804.

It is an arithmetic number, because the mean of its divisors is an integer number (1364403040).

Almost surely, 2^21023361099 is an apocalyptic number.

21023361099 is a deficient number, since it is larger than the sum of its proper divisors (11722311861).

21023361099 is a wasteful number, since it uses less digits than its factorization.

21023361099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234451 (or 234448 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The spelling of 21023361099 in words is "twenty-one billion, twenty-three million, three hundred sixty-one thousand, ninety-nine".