21163207870 has 16 divisors (see below), whose sum is σ = 43535742048. Its totient is φ = 7255956960.

The previous prime is 21163207801. The next prime is 21163207913. The reversal of 21163207870 is 7870236112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151165701 + ... + 151165840.

It is an arithmetic number, because the mean of its divisors is an integer number (2720983878).

Almost surely, 2^21163207870 is an apocalyptic number.

21163207870 is an abundant number, since it is smaller than the sum of its proper divisors (22372534178).

21163207870 is a wasteful number, since it uses less digits than its factorization.

21163207870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302331555.

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 21163207870 in words is "twenty-one billion, one hundred sixty-three million, two hundred seven thousand, eight hundred seventy".