21220023133 has 4 divisors (see below), whose sum is σ = 21350207488. Its totient is φ = 21089838780.

The previous prime is 21220023119. The next prime is 21220023151. The reversal of 21220023133 is 33132002212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220023133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21220023133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220023193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65091933 + ... + 65092258.

It is an arithmetic number, because the mean of its divisors is an integer number (5337551872).

Almost surely, 2^21220023133 is an apocalyptic number.

It is an amenable number.

21220023133 is a deficient number, since it is larger than the sum of its proper divisors (130184355).

21220023133 is a wasteful number, since it uses less digits than its factorization.

21220023133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130184354.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21220023133 its reverse (33132002212), we get a palindrome (54352025345).

The spelling of 21220023133 in words is "twenty-one billion, two hundred twenty million, twenty-three thousand, one hundred thirty-three".