21238976985 has 16 divisors (see below), whose sum is σ = 34900806336. Its totient is φ = 11021306688.

The previous prime is 21238976977. The next prime is 21238977007. The reversal of 21238976985 is 58967983212.

It is not a de Polignac number, because 21238976985 - 2³ = 21238976977 is a prime.

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, 19133659 + ... + 19134768.

It is an arithmetic number, because the mean of its divisors is an integer number (2181300396).

Almost surely, 2^21238976985 is an apocalyptic number.

It is an amenable number.

21238976985 is a deficient number, since it is larger than the sum of its proper divisors (13661829351).

21238976985 is a wasteful number, since it uses less digits than its factorization.

21238976985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38268472.

The product of its digits is 13063680, while the sum is 60.

The spelling of 21238976985 in words is "twenty-one billion, two hundred thirty-eight million, nine hundred seventy-six thousand, nine hundred eighty-five".