21021122012223 has 16 divisors (see below), whose sum is σ = 28542423087360. Its totient is φ = 13757604586176.

The previous prime is 21021122012173. The next prime is 21021122012227. The reversal of 21021122012223 is 32221022112012.

It is not a de Polignac number, because 21021122012223 - 2⁶ = 21021122012159 is a prime.

It is a super-2 number, since 2×21021122012223² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21021122012223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021122012227) 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, 81551790 + ... + 81809147.

It is an arithmetic number, because the mean of its divisors is an integer number (1783901442960).

Almost surely, 2^{21021122012223} is an apocalyptic number.

21021122012223 is a deficient number, since it is larger than the sum of its proper divisors (7521301075137).

21021122012223 is a wasteful number, since it uses less digits than its factorization.

21021122012223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163361726.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21021122012223 its reverse (32221022112012), we get a palindrome (53242144124235).

The spelling of 21021122012223 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-two million, twelve thousand, two hundred twenty-three".