21112021233 has 24 divisors (see below), whose sum is σ = 31489692416. Its totient is φ = 13615970400.

The previous prime is 21112021201. The next prime is 21112021237. The reversal of 21112021233 is 33212021112.

It is not a de Polignac number, because 21112021233 - 2⁵ = 21112021201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21112021237) 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, 917991 + ... + 940707.

Almost surely, 2^21112021233 is an apocalyptic number.

It is an amenable number.

21112021233 is a deficient number, since it is larger than the sum of its proper divisors (10377671183).

21112021233 is a wasteful number, since it uses less digits than its factorization.

21112021233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26085 (or 26082 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21112021233 its reverse (33212021112), we get a palindrome (54324042345).

The spelling of 21112021233 in words is "twenty-one billion, one hundred twelve million, twenty-one thousand, two hundred thirty-three".