21152031657890 has 32 divisors (see below), whose sum is σ = 43694812592640. Its totient is φ = 7221781514304.

The previous prime is 21152031657833. The next prime is 21152031657907. The reversal of 21152031657890 is 9875613025112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 632142017 + ... + 632175476.

It is an arithmetic number, because the mean of its divisors is an integer number (1365462893520).

Almost surely, 2^{21152031657890} is an apocalyptic number.

21152031657890 is an abundant number, since it is smaller than the sum of its proper divisors (22542780934750).

21152031657890 is a wasteful number, since it uses less digits than its factorization.

21152031657890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264317746.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 21152031657890 in words is "twenty-one trillion, one hundred fifty-two billion, thirty-one million, six hundred fifty-seven thousand, eight hundred ninety".