21323211985 has 16 divisors (see below), whose sum is σ = 27186321600. Its totient is φ = 16009707456.

The previous prime is 21323211977. The next prime is 21323211991. The reversal of 21323211985 is 58911232312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21323211985 - 2³ = 21323211977 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, 1038690 + ... + 1059019.

It is an arithmetic number, because the mean of its divisors is an integer number (1699145100).

Almost surely, 2^21323211985 is an apocalyptic number.

It is an amenable number.

21323211985 is a deficient number, since it is larger than the sum of its proper divisors (5863109615).

21323211985 is a wasteful number, since it uses less digits than its factorization.

21323211985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097840.

The product of its digits is 25920, while the sum is 37.

The spelling of 21323211985 in words is "twenty-one billion, three hundred twenty-three million, two hundred eleven thousand, nine hundred eighty-five".