31201312220 has 48 divisors (see below), whose sum is σ = 71036632800. Its totient is φ = 11443151616.

The previous prime is 31201312217. The next prime is 31201312223. The reversal of 31201312220 is 2221310213.

It is an interprime number because it is at equal distance from previous prime (31201312217) and next prime (31201312223).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201312223) 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, 363962 + ... + 441441.

It is an arithmetic number, because the mean of its divisors is an integer number (1479929850).

Almost surely, 2^31201312220 is an apocalyptic number.

It is an amenable number.

31201312220 is an abundant number, since it is smaller than the sum of its proper divisors (39835320580).

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

31201312220 is a wasteful number, since it uses less digits than its factorization.

31201312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805574 (or 805572 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31201312220 its reverse (2221310213), we get a palindrome (33422622433).

The spelling of 31201312220 in words is "thirty-one billion, two hundred one million, three hundred twelve thousand, two hundred twenty".