31220302212 has 72 divisors (see below), whose sum is σ = 89835520320. Its totient is φ = 9049360320.

The previous prime is 31220302199. The next prime is 31220302231. The reversal of 31220302212 is 21220302213.

It is a super-2 number, since 2×31220302212² (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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1704787 + ... + 1723002.

It is an arithmetic number, because the mean of its divisors is an integer number (1247715560).

Almost surely, 2^31220302212 is an apocalyptic number.

It is an amenable number.

31220302212 is an abundant number, since it is smaller than the sum of its proper divisors (58615218108).

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

31220302212 is a wasteful number, since it uses less digits than its factorization.

31220302212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427833 (or 3427828 counting only the distinct ones).

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

Adding to 31220302212 its reverse (21220302213), we get a palindrome (52440604425).

Subtracting from 31220302212 its reverse (21220302213), we obtain a palindrome (9999999999).

The spelling of 31220302212 in words is "thirty-one billion, two hundred twenty million, three hundred two thousand, two hundred twelve".