31213033002 has 24 divisors (see below), whose sum is σ = 67668156036. Its totient is φ = 10398203136.

The previous prime is 31213033001. The next prime is 31213033013. The reversal of 31213033002 is 20033031213.

It can be written as a sum of positive squares in 2 ways, for example, as 21549946401 + 9663086601 = 146799^2 + 98301^2 .

It is a super-2 number, since 2×31213033002² (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 not an unprimeable number, because it can be changed into a prime (31213033001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 480373 + ... + 541464.

Almost surely, 2^31213033002 is an apocalyptic number.

31213033002 is an abundant number, since it is smaller than the sum of its proper divisors (36455123034).

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

31213033002 is a wasteful number, since it uses less digits than its factorization.

31213033002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023542 (or 1023539 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 31213033002 its reverse (20033031213), we get a palindrome (51246064215).

The spelling of 31213033002 in words is "thirty-one billion, two hundred thirteen million, thirty-three thousand, two".