21222236656131 has 16 divisors (see below), whose sum is σ = 32339233807104. Its totient is φ = 12126772072224.

The previous prime is 21222236656129. The next prime is 21222236656163. The reversal of 21222236656131 is 13165663222212.

It is not a de Polignac number, because 21222236656131 - 2¹ = 21222236656129 is a prime.

It is a super-2 number, since 2×21222236656131² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21222236656531) 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, 7992201 + ... + 10311146.

It is an arithmetic number, because the mean of its divisors is an integer number (2021202112944).

Almost surely, 2^{21222236656131} is an apocalyptic number.

21222236656131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21222236656131 is a deficient number, since it is larger than the sum of its proper divisors (11116997150973).

21222236656131 is a wasteful number, since it uses less digits than its factorization.

21222236656131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18358570.

The product of its digits is 311040, while the sum is 42.

Adding to 21222236656131 its reverse (13165663222212), we get a palindrome (34387899878343).

The spelling of 21222236656131 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred thirty-six million, six hundred fifty-six thousand, one hundred thirty-one".