31220121312206 has 16 divisors (see below), whose sum is σ = 47965376659200. Its totient is φ = 15232361224248.

The previous prime is 31220121312181. The next prime is 31220121312253. The reversal of 31220121312206 is 60221312102213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174609716 + ... + 174788423.

It is an arithmetic number, because the mean of its divisors is an integer number (2997836041200).

Almost surely, 2^{31220121312206} is an apocalyptic number.

31220121312206 is a deficient number, since it is larger than the sum of its proper divisors (16745255346994).

31220121312206 is a wasteful number, since it uses less digits than its factorization.

31220121312206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349399223.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 31220121312206 its reverse (60221312102213), we get a palindrome (91441433414419).

The spelling of 31220121312206 in words is "thirty-one trillion, two hundred twenty billion, one hundred twenty-one million, three hundred twelve thousand, two hundred six".