31310221100021 has 8 divisors (see below), whose sum is σ = 31405056801888. Its totient is φ = 31215386862000.

The previous prime is 31310221099957. The next prime is 31310221100023. The reversal of 31310221100021 is 12000112201313.

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 31310221100021 - 2⁶ = 31310221099957 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 (31310221100023) 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, 55250291 + ... + 55814111.

It is an arithmetic number, because the mean of its divisors is an integer number (3925632100236).

Almost surely, 2^{31310221100021} is an apocalyptic number.

It is an amenable number.

31310221100021 is a deficient number, since it is larger than the sum of its proper divisors (94835701867).

31310221100021 is a wasteful number, since it uses less digits than its factorization.

31310221100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731923.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31310221100021 its reverse (12000112201313), we get a palindrome (43310333301334).

The spelling of 31310221100021 in words is "thirty-one trillion, three hundred ten billion, two hundred twenty-one million, one hundred thousand, twenty-one".