21133110023 has 16 divisors (see below), whose sum is σ = 22532235264. Its totient is φ = 19751556480.

The previous prime is 21133110001. The next prime is 21133110041. The reversal of 21133110023 is 32001133112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21133110023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21133109983 and 21133110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133110073) 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, 3491786 + ... + 3497832.

It is an arithmetic number, because the mean of its divisors is an integer number (1408264704).

Almost surely, 2^21133110023 is an apocalyptic number.

21133110023 is a deficient number, since it is larger than the sum of its proper divisors (1399125241).

21133110023 is a wasteful number, since it uses less digits than its factorization.

21133110023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7462.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21133110023 its reverse (32001133112), we get a palindrome (53134243135).

It can be divided in two parts, 2113 and 3110023, that added together give a cube (3112136 = 146³).

The spelling of 21133110023 in words is "twenty-one billion, one hundred thirty-three million, one hundred ten thousand, twenty-three".