31202320212 has 144 divisors (see below), whose sum is σ = 91683679360. Its totient is φ = 8763116544.

The previous prime is 31202320207. The next prime is 31202320231. The reversal of 31202320212 is 21202320213.

It is a super-2 number, since 2×31202320212² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5755239 + ... + 5760657.

Almost surely, 2^31202320212 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 31202320212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45841839680).

31202320212 is an abundant number, since it is smaller than the sum of its proper divisors (60481359148).

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

31202320212 is a wasteful number, since it uses less digits than its factorization.

31202320212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5822 (or 5817 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31202320212 its reverse (21202320213), we get a palindrome (52404640425).

Subtracting from 31202320212 its reverse (21202320213), we obtain a palindrome (9999999999).

The spelling of 31202320212 in words is "thirty-one billion, two hundred two million, three hundred twenty thousand, two hundred twelve".