31242213208 has 32 divisors (see below), whose sum is σ = 61164920160. Its totient is φ = 14932431360.

The previous prime is 31242213203. The next prime is 31242213229. The reversal of 31242213208 is 80231224213.

It is a super-2 number, since 2×31242213208² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31242213203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240688 + ... + 347008.

It is an arithmetic number, because the mean of its divisors is an integer number (1911403755).

Almost surely, 2^31242213208 is an apocalyptic number.

It is an amenable number.

31242213208 is a deficient number, since it is larger than the sum of its proper divisors (29922706952).

31242213208 is a wasteful number, since it uses less digits than its factorization.

31242213208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107947 (or 107943 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The spelling of 31242213208 in words is "thirty-one billion, two hundred forty-two million, two hundred thirteen thousand, two hundred eight".