31212403352 has 64 divisors (see below), whose sum is σ = 63445032000. Its totient is φ = 14309982720.

The previous prime is 31212403319. The next prime is 31212403357. The reversal of 31212403352 is 25330421213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212403357) 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, 24441338 + ... + 24442614.

It is an arithmetic number, because the mean of its divisors is an integer number (991328625).

Almost surely, 2^31212403352 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 31212403352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31722516000).

31212403352 is an abundant number, since it is smaller than the sum of its proper divisors (32232628648).

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

31212403352 is a wasteful number, since it uses less digits than its factorization.

31212403352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676 (or 2672 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 31212403352 its reverse (25330421213), we get a palindrome (56542824565).

The spelling of 31212403352 in words is "thirty-one billion, two hundred twelve million, four hundred three thousand, three hundred fifty-two".