31031020212 has 48 divisors (see below), whose sum is σ = 74815501824. Its totient is φ = 10000080000.

The previous prime is 31031020201. The next prime is 31031020217. The reversal of 31031020212 is 21202013013.

It is a junction number, because it is equal to n+sod(n) for n = 31031020191 and 31031020200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031020217) 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, 338962 + ... + 420662.

It is an arithmetic number, because the mean of its divisors is an integer number (1558656288).

Almost surely, 2^31031020212 is an apocalyptic number.

It is an amenable number.

31031020212 is an abundant number, since it is smaller than the sum of its proper divisors (43784481612).

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

31031020212 is a wasteful number, since it uses less digits than its factorization.

31031020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82760 (or 82758 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31031020212 its reverse (21202013013), we get a palindrome (52233033225).

The spelling of 31031020212 in words is "thirty-one billion, thirty-one million, twenty thousand, two hundred twelve".