21011222012231 has 24 divisors (see below), whose sum is σ = 23179621997280. Its totient is φ = 19031219665920.

The previous prime is 21011222012213. The next prime is 21011222012243. The reversal of 21011222012231 is 13221022211012.

It is not a de Polignac number, because 21011222012231 - 2⁶ = 21011222012167 is a prime.

It is a super-2 number, since 2×21011222012231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011222212231) 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, 40471511 + ... + 40987383.

It is an arithmetic number, because the mean of its divisors is an integer number (965817583220).

Almost surely, 2^{21011222012231} is an apocalyptic number.

21011222012231 is a deficient number, since it is larger than the sum of its proper divisors (2168399985049).

21011222012231 is a wasteful number, since it uses less digits than its factorization.

21011222012231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517127 (or 517116 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21011222012231 its reverse (13221022211012), we get a palindrome (34232244223243).

The spelling of 21011222012231 in words is "twenty-one trillion, eleven billion, two hundred twenty-two million, twelve thousand, two hundred thirty-one".