31021221000037 has 2 divisors, whose sum is σ = 31021221000038. Its totient is φ = 31021221000036.

The previous prime is 31021220999963. The next prime is 31021221000043. The reversal of 31021221000037 is 73000012212013.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17449409208001 + 13571811792036 = 4177249^2 + 3683994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31021221000037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31021220999981 and 31021221000017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31021221001037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510610500018 + 15510610500019.

It is an arithmetic number, because the mean of its divisors is an integer number (15510610500019).

Almost surely, 2^{31021221000037} is an apocalyptic number.

It is an amenable number.

31021221000037 is a deficient number, since it is larger than the sum of its proper divisors (1).

31021221000037 is an equidigital number, since it uses as much as digits as its factorization.

31021221000037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The spelling of 31021221000037 in words is "thirty-one trillion, twenty-one billion, two hundred twenty-one million, thirty-seven", and thus it is an aban number.