21013331220023 has 16 divisors (see below), whose sum is σ = 21126607067136. Its totient is φ = 20900344520160.

The previous prime is 21013331219977. The next prime is 21013331220047. The reversal of 21013331220023 is 32002213331012.

It is a cyclic number.

It is not a de Polignac number, because 21013331220023 - 2⁸ = 21013331219767 is a prime.

It is a super-2 number, since 2×21013331220023² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013331220823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1166555765 + ... + 1166573777.

It is an arithmetic number, because the mean of its divisors is an integer number (1320412941696).

Almost surely, 2^{21013331220023} is an apocalyptic number.

21013331220023 is a deficient number, since it is larger than the sum of its proper divisors (113275847113).

21013331220023 is a wasteful number, since it uses less digits than its factorization.

21013331220023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25694.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21013331220023 its reverse (32002213331012), we get a palindrome (53015544551035).

The spelling of 21013331220023 in words is "twenty-one trillion, thirteen billion, three hundred thirty-one million, two hundred twenty thousand, twenty-three".