31020212120 has 64 divisors (see below), whose sum is σ = 74011993920. Its totient is φ = 11660673024.

The previous prime is 31020212089. The next prime is 31020212129. The reversal of 31020212120 is 2121202013.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31020212095 and 31020212104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020212129) 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, 423749 + ... + 491531.

It is an arithmetic number, because the mean of its divisors is an integer number (1156437405).

Almost surely, 2^31020212120 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 31020212120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37005996960).

31020212120 is an abundant number, since it is smaller than the sum of its proper divisors (42991781800).

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

31020212120 is a wasteful number, since it uses less digits than its factorization.

31020212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68484 (or 68480 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 31020212120 its reverse (2121202013), we get a palindrome (33141414133).

The spelling of 31020212120 in words is "thirty-one billion, twenty million, two hundred twelve thousand, one hundred twenty".