31230220212 has 36 divisors (see below), whose sum is σ = 78996495396. Its totient is φ = 10403026560.

The previous prime is 31230220211. The next prime is 31230220261. The reversal of 31230220212 is 21202203213.

31230220212 is a `hidden beast` number, since 3 + 1 + 230 + 220 + 212 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19668379536 + 11561840676 = 140244^2 + 107526^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230220211) 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, 239563 + ... + 346194.

Almost surely, 2^31230220212 is an apocalyptic number.

It is an amenable number.

31230220212 is an abundant number, since it is smaller than the sum of its proper divisors (47766275184).

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

31230220212 is a wasteful number, since it uses less digits than its factorization.

31230220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587248 (or 587243 counting only the distinct ones).

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

Adding to 31230220212 its reverse (21202203213), we get a palindrome (52432423425).

The spelling of 31230220212 in words is "thirty-one billion, two hundred thirty million, two hundred twenty thousand, two hundred twelve".