31421313200021 has 8 divisors (see below), whose sum is σ = 31447484294688. Its totient is φ = 31395145210000.

The previous prime is 31421313199967. The next prime is 31421313200033. The reversal of 31421313200021 is 12000231312413.

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 31421313200021 - 2³⁴ = 31404133330837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31421313200021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421313200051) 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, 19698386 + ... + 21233676.

It is an arithmetic number, because the mean of its divisors is an integer number (3930935536836).

Almost surely, 2^{31421313200021} is an apocalyptic number.

It is an amenable number.

31421313200021 is a deficient number, since it is larger than the sum of its proper divisors (26171094667).

31421313200021 is a wasteful number, since it uses less digits than its factorization.

31421313200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552323.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31421313200021 its reverse (12000231312413), we get a palindrome (43421544512434).

The spelling of 31421313200021 in words is "thirty-one trillion, four hundred twenty-one billion, three hundred thirteen million, two hundred thousand, twenty-one".