31221002220212 has 24 divisors (see below), whose sum is σ = 62539417899840. Its totient is φ = 13359555210240.

The previous prime is 31221002220181. The next prime is 31221002220223. The reversal of 31221002220212 is 21202220012213.

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, 869744762 + ... + 869780657.

It is an arithmetic number, because the mean of its divisors is an integer number (2605809079160).

Almost surely, 2^{31221002220212} is an apocalyptic number.

It is an amenable number.

31221002220212 is an abundant number, since it is smaller than the sum of its proper divisors (31318415679628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31221002220212 is a wasteful number, since it uses less digits than its factorization.

31221002220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739526071 (or 1739526069 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31221002220212 its reverse (21202220012213), we get a palindrome (52423222232425).

The spelling of 31221002220212 in words is "thirty-one trillion, two hundred twenty-one billion, two million, two hundred twenty thousand, two hundred twelve".