31420516605621 has 128 divisors (see below), whose sum is σ = 52041869107200. Its totient is φ = 16600281384960.

The previous prime is 31420516605619. The next prime is 31420516605637. The reversal of 31420516605621 is 12650661502413.

It is not a de Polignac number, because 31420516605621 - 2¹ = 31420516605619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420516605641) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 105014385 + ... + 105313161.

It is an arithmetic number, because the mean of its divisors is an integer number (406577102400).

Almost surely, 2^{31420516605621} is an apocalyptic number.

It is an amenable number.

31420516605621 is a deficient number, since it is larger than the sum of its proper divisors (20621352501579).

31420516605621 is a wasteful number, since it uses less digits than its factorization.

31420516605621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299019.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 31420516605621 in words is "thirty-one trillion, four hundred twenty billion, five hundred sixteen million, six hundred five thousand, six hundred twenty-one".