31213212222104 has 64 divisors (see below), whose sum is σ = 65386747514880. Its totient is φ = 13845832560000.

The previous prime is 31213212222103. The next prime is 31213212222107. The reversal of 31213212222104 is 40122221231213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213212222103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 772094 + ... + 7938674.

It is an arithmetic number, because the mean of its divisors is an integer number (1021667929920).

Almost surely, 2^{31213212222104} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31213212222104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32693373757440).

31213212222104 is an abundant number, since it is smaller than the sum of its proper divisors (34173535292776).

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

31213212222104 is a wasteful number, since it uses less digits than its factorization.

31213212222104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7167792 (or 7167788 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 31213212222104 its reverse (40122221231213), we get a palindrome (71335433453317).

The spelling of 31213212222104 in words is "thirty-one trillion, two hundred thirteen billion, two hundred twelve million, two hundred twenty-two thousand, one hundred four".