31013313001221 has 32 divisors (see below), whose sum is σ = 42848308863360. Its totient is φ = 19929315458304.

The previous prime is 31013313001171. The next prime is 31013313001249. The reversal of 31013313001221 is 12210031331013.

It is a happy number.

It is not a de Polignac number, because 31013313001221 - 2¹⁷ = 31013312870149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31013313001421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 471100710 + ... + 471166536.

It is an arithmetic number, because the mean of its divisors is an integer number (1339009651980).

Almost surely, 2^{31013313001221} is an apocalyptic number.

It is an amenable number.

31013313001221 is a deficient number, since it is larger than the sum of its proper divisors (11834995862139).

31013313001221 is a wasteful number, since it uses less digits than its factorization.

31013313001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74805.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 31013313001221 its reverse (12210031331013), we get a palindrome (43223344332234).

The spelling of 31013313001221 in words is "thirty-one trillion, thirteen billion, three hundred thirteen million, one thousand, two hundred twenty-one".