31221100121031 has 12 divisors (see below), whose sum is σ = 47057890037808. Its totient is φ = 19909107323424.

The previous prime is 31221100121021. The next prime is 31221100121047. The reversal of 31221100121031 is 13012100112213.

31221100121031 is a `hidden beast` number, since 312 + 2 + 110 + 0 + 1 + 210 + 31 = 666.

It is not a de Polignac number, because 31221100121031 - 2¹⁸ = 31221099858887 is a prime.

It is a super-2 number, since 2×31221100121031² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31221100120995 and 31221100121013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221100121021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75413285110 + ... + 75413285523.

It is an arithmetic number, because the mean of its divisors is an integer number (3921490836484).

Almost surely, 2^{31221100121031} is an apocalyptic number.

31221100121031 is a deficient number, since it is larger than the sum of its proper divisors (15836789916777).

31221100121031 is a wasteful number, since it uses less digits than its factorization.

31221100121031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150826570662 (or 150826570659 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 31221100121031 its reverse (13012100112213), we get a palindrome (44233200233244).

The spelling of 31221100121031 in words is "thirty-one trillion, two hundred twenty-one billion, one hundred million, one hundred twenty-one thousand, thirty-one".