31013121231221 has 8 divisors (see below), whose sum is σ = 31049613295200. Its totient is φ = 30976638536880.

The previous prime is 31013121231173. The next prime is 31013121231223. The reversal of 31013121231221 is 12213212131013.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31013121231221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31013121231223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4292450 + ... + 8969468.

It is an arithmetic number, because the mean of its divisors is an integer number (3881201661900).

Almost surely, 2^{31013121231221} is an apocalyptic number.

It is an amenable number.

31013121231221 is a deficient number, since it is larger than the sum of its proper divisors (36492063979).

31013121231221 is an equidigital number, since it uses as much as digits as its factorization.

31013121231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4684819.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31013121231221 its reverse (12213212131013), we get a palindrome (43226333362234).

The spelling of 31013121231221 in words is "thirty-one trillion, thirteen billion, one hundred twenty-one million, two hundred thirty-one thousand, two hundred twenty-one".