31000223212 has 12 divisors (see below), whose sum is σ = 62000446480. Its totient is φ = 13285809936.

The previous prime is 31000223171. The next prime is 31000223213. The reversal of 31000223212 is 21232200013.

31000223212 is an admirable number.

It is a super-2 number, since 2×31000223212² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31000223213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553575387 + ... + 553575442.

Almost surely, 2^31000223212 is an apocalyptic number.

It is an amenable number.

31000223212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31000223212 is a wasteful number, since it uses less digits than its factorization.

31000223212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107150840 (or 1107150838 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31000223212 its reverse (21232200013), we get a palindrome (52232423225).

The spelling of 31000223212 in words is "thirty-one billion, two hundred twenty-three thousand, two hundred twelve".