31021212130224 has 160 divisors (see below), whose sum is σ = 84304270848000. Its totient is φ = 9810413293824.

The previous prime is 31021212130219. The next prime is 31021212130231. The reversal of 31021212130224 is 42203121212013.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 31021212130194 and 31021212130203.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89623317 + ... + 89968779.

It is an arithmetic number, because the mean of its divisors is an integer number (526901692800).

Almost surely, 2^{31021212130224} 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 31021212130224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42152135424000).

31021212130224 is an abundant number, since it is smaller than the sum of its proper divisors (53283058717776).

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

31021212130224 is a wasteful number, since it uses less digits than its factorization.

31021212130224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346159 (or 346153 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 31021212130224 its reverse (42203121212013), we get a palindrome (73224333342237).

The spelling of 31021212130224 in words is "thirty-one trillion, twenty-one billion, two hundred twelve million, one hundred thirty thousand, two hundred twenty-four".