31021940268 has 72 divisors (see below), whose sum is σ = 85740695040. Its totient is φ = 9379121760.

The previous prime is 31021940251. The next prime is 31021940293. The reversal of 31021940268 is 86204912013.

31021940268 is a `hidden beast` number, since 31 + 0 + 219 + 402 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84621 + ... + 263067.

Almost surely, 2^31021940268 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31021940268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42870347520).

31021940268 is an abundant number, since it is smaller than the sum of its proper divisors (54718754772).

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

31021940268 is a wasteful number, since it uses less digits than its factorization.

31021940268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178907 (or 178902 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 31021940268 in words is "thirty-one billion, twenty-one million, nine hundred forty thousand, two hundred sixty-eight".