21311201011233 has 48 divisors (see below), whose sum is σ = 33948694259520. Its totient is φ = 11848268525184.

The previous prime is 21311201011229. The next prime is 21311201011283. The reversal of 21311201011233 is 33211010211312.

It is not a de Polignac number, because 21311201011233 - 2² = 21311201011229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21311201011283) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 203164923 + ... + 203269791.

It is an arithmetic number, because the mean of its divisors is an integer number (707264463740).

Almost surely, 2^{21311201011233} is an apocalyptic number.

It is an amenable number.

21311201011233 is a deficient number, since it is larger than the sum of its proper divisors (12637493248287).

21311201011233 is a wasteful number, since it uses less digits than its factorization.

21311201011233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142286 (or 142279 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21311201011233 its reverse (33211010211312), we get a palindrome (54522211222545).

The spelling of 21311201011233 in words is "twenty-one trillion, three hundred eleven billion, two hundred one million, eleven thousand, two hundred thirty-three".