31030021120212 has 18 divisors (see below), whose sum is σ = 78436997831738. Its totient is φ = 10343340373392.

The previous prime is 31030021120177. The next prime is 31030021120229. The reversal of 31030021120212 is 21202112003013.

31030021120212 is a `hidden beast` number, since 3 + 10 + 300 + 21 + 120 + 212 = 666.

It can be written as a sum of positive squares in only one way, i.e., 31016389623696 + 13631496516 = 5569236^2 + 116754^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 430972515523 + ... + 430972515594.

Almost surely, 2^{31030021120212} is an apocalyptic number.

It is an amenable number.

31030021120212 is an abundant number, since it is smaller than the sum of its proper divisors (47406976711526).

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

31030021120212 is a wasteful number, since it uses less digits than its factorization.

31030021120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861945031127 (or 861945031122 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31030021120212 its reverse (21202112003013), we get a palindrome (52232133123225).

The spelling of 31030021120212 in words is "thirty-one trillion, thirty billion, twenty-one million, one hundred twenty thousand, two hundred twelve".