21303023193 has 32 divisors (see below), whose sum is σ = 33231401600. Its totient is φ = 13450364928.

The previous prime is 21303023191. The next prime is 21303023219. The reversal of 21303023193 is 39132030312.

It is not a de Polignac number, because 21303023193 - 2¹ = 21303023191 is a prime.

It is a super-2 number, since 2×21303023193² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21303023191) 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, 3247605 + ... + 3254157.

It is an arithmetic number, because the mean of its divisors is an integer number (1038481300).

Almost surely, 2^21303023193 is an apocalyptic number.

It is an amenable number.

21303023193 is a deficient number, since it is larger than the sum of its proper divisors (11928378407).

21303023193 is a wasteful number, since it uses less digits than its factorization.

21303023193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12918 (or 12912 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The spelling of 21303023193 in words is "twenty-one billion, three hundred three million, twenty-three thousand, one hundred ninety-three".