31870645021 has 8 divisors (see below), whose sum is σ = 32029049888. Its totient is φ = 31712310000.

The previous prime is 31870645007. The next prime is 31870645031. The reversal of 31870645021 is 12054607813.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31870645021 - 2⁷ = 31870644893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31870645031) 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, 1061506 + ... + 1091116.

It is an arithmetic number, because the mean of its divisors is an integer number (4003631236).

Almost surely, 2^31870645021 is an apocalyptic number.

It is an amenable number.

31870645021 is a deficient number, since it is larger than the sum of its proper divisors (158404867).

31870645021 is a wasteful number, since it uses less digits than its factorization.

31870645021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34923.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 31870645021 in words is "thirty-one billion, eight hundred seventy million, six hundred forty-five thousand, twenty-one".