31312100203021 has 8 divisors (see below), whose sum is σ = 34167651034464. Its totient is φ = 28458048749520.

The previous prime is 31312100202991. The next prime is 31312100203031. The reversal of 31312100203021 is 12030200121313.

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-31312100203021 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 31312100203021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312100203031) 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, 374800815 + ... + 374884348.

It is an arithmetic number, because the mean of its divisors is an integer number (4270956379308).

Almost surely, 2^{31312100203021} is an apocalyptic number.

It is an amenable number.

31312100203021 is a deficient number, since it is larger than the sum of its proper divisors (2855550831443).

31312100203021 is a wasteful number, since it uses less digits than its factorization.

31312100203021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749688971.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31312100203021 its reverse (12030200121313), we get a palindrome (43342300324334).

The spelling of 31312100203021 in words is "thirty-one trillion, three hundred twelve billion, one hundred million, two hundred three thousand, twenty-one".