31221010212 has 48 divisors (see below), whose sum is σ = 84064361472. Its totient is φ = 8833681440.

The previous prime is 31221010201. The next prime is 31221010217. The reversal of 31221010212 is 21201012213.

It is a junction number, because it is equal to n+sod(n) for n = 31221010191 and 31221010200.

It is not an unprimeable number, because it can be changed into a prime (31221010217) 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, 1795614 + ... + 1812917.

It is an arithmetic number, because the mean of its divisors is an integer number (1751340864).

Almost surely, 2^31221010212 is an apocalyptic number.

It is an amenable number.

31221010212 is an abundant number, since it is smaller than the sum of its proper divisors (52843351260).

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

31221010212 is a wasteful number, since it uses less digits than its factorization.

31221010212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608648 (or 3608646 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 31221010212 its reverse (21201012213), we get a palindrome (52422022425).

The spelling of 31221010212 in words is "thirty-one billion, two hundred twenty-one million, ten thousand, two hundred twelve".