21122982985 has 24 divisors (see below), whose sum is σ = 27459311040. Its totient is φ = 15591730752.

The previous prime is 21122982983. The next prime is 21122983033. The reversal of 21122982985 is 58928922112.

It is not a de Polignac number, because 21122982985 - 2¹ = 21122982983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21122982983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2790636 + ... + 2798194.

It is an arithmetic number, because the mean of its divisors is an integer number (1144137960).

Almost surely, 2^21122982985 is an apocalyptic number.

It is an amenable number.

21122982985 is a deficient number, since it is larger than the sum of its proper divisors (6336328055).

21122982985 is a wasteful number, since it uses less digits than its factorization.

21122982985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10897 (or 10884 counting only the distinct ones).

The product of its digits is 414720, while the sum is 49.

The spelling of 21122982985 in words is "twenty-one billion, one hundred twenty-two million, nine hundred eighty-two thousand, nine hundred eighty-five".