31331201122221 has 64 divisors (see below), whose sum is σ = 56108432916480. Its totient is φ = 15018860643840.

The previous prime is 31331201122183. The next prime is 31331201122241. The reversal of 31331201122221 is 12222110213313.

It is not a de Polignac number, because 31331201122221 - 2¹¹ = 31331201120173 is a prime.

It is a super-2 number, since 2×31331201122221² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31331201122191 and 31331201122200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331201122241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7101300 + ... + 10634418.

It is an arithmetic number, because the mean of its divisors is an integer number (876694264320).

Almost surely, 2^{31331201122221} is an apocalyptic number.

It is an amenable number.

31331201122221 is a deficient number, since it is larger than the sum of its proper divisors (24777231794259).

31331201122221 is a wasteful number, since it uses less digits than its factorization.

31331201122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3536106.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 31331201122221 its reverse (12222110213313), we get a palindrome (43553311335534).

The spelling of 31331201122221 in words is "thirty-one trillion, three hundred thirty-one billion, two hundred one million, one hundred twenty-two thousand, two hundred twenty-one".