31212122202 has 40 divisors (see below), whose sum is σ = 70118205300. Its totient is φ = 10377274176.

The previous prime is 31212122189. The next prime is 31212122203. The reversal of 31212122202 is 20222121213.

It can be written as a sum of positive squares in 2 ways, for example, as 29459946321 + 1752175881 = 171639^2 + 41859^2 .

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 (31212122203) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 184627 + ... + 310662.

Almost surely, 2^31212122202 is an apocalyptic number.

31212122202 is an abundant number, since it is smaller than the sum of its proper divisors (38906083098).

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

31212122202 is a wasteful number, since it uses less digits than its factorization.

31212122202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495692 (or 495683 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 31212122202 its reverse (20222121213), we get a palindrome (51434243415).

The spelling of 31212122202 in words is "thirty-one billion, two hundred twelve million, one hundred twenty-two thousand, two hundred two".