31213413442021 has 8 divisors (see below), whose sum is σ = 32575487941080. Its totient is φ = 29870388936192.

The previous prime is 31213413441989. The next prime is 31213413442031. The reversal of 31213413442021 is 12024431431213.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 577963337121 + 30635450104900 = 760239^2 + 5534930^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31213413442021 - 2⁵ = 31213413441989 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 (31213413442031) 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 7 ways as a sum of consecutive naturals, for example, 4762494960 + ... + 4762501513.

It is an arithmetic number, because the mean of its divisors is an integer number (4071935992635).

Almost surely, 2^{31213413442021} is an apocalyptic number.

It is an amenable number.

31213413442021 is a deficient number, since it is larger than the sum of its proper divisors (1362074499059).

31213413442021 is a wasteful number, since it uses less digits than its factorization.

31213413442021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9524996615.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 31213413442021 its reverse (12024431431213), we get a palindrome (43237844873234).

The spelling of 31213413442021 in words is "thirty-one trillion, two hundred thirteen billion, four hundred thirteen million, four hundred forty-two thousand, twenty-one".