21305875870 has 8 divisors (see below), whose sum is σ = 38350576584. Its totient is φ = 8522350344.

The previous prime is 21305875861. The next prime is 21305875907. The reversal of 21305875870 is 7857850312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21305875870.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1065293784 + ... + 1065293803.

It is an arithmetic number, because the mean of its divisors is an integer number (4793822073).

Almost surely, 2^21305875870 is an apocalyptic number.

21305875870 is a deficient number, since it is larger than the sum of its proper divisors (17044700714).

21305875870 is a wasteful number, since it uses less digits than its factorization.

21305875870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130587594.

The product of its (nonzero) digits is 470400, while the sum is 46.

The spelling of 21305875870 in words is "twenty-one billion, three hundred five million, eight hundred seventy-five thousand, eight hundred seventy".