21982398221 has 16 divisors (see below), whose sum is σ = 25260385920. Its totient is φ = 18739097280.

The previous prime is 21982398203. The next prime is 21982398241. The reversal of 21982398221 is 12289328912.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21982398221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21982398241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 979595 + ... + 1001783.

It is an arithmetic number, because the mean of its divisors is an integer number (1578774120).

Almost surely, 2^21982398221 is an apocalyptic number.

It is an amenable number.

21982398221 is a deficient number, since it is larger than the sum of its proper divisors (3277987699).

21982398221 is a wasteful number, since it uses less digits than its factorization.

21982398221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22964.

The product of its digits is 248832, while the sum is 47.

The spelling of 21982398221 in words is "twenty-one billion, nine hundred eighty-two million, three hundred ninety-eight thousand, two hundred twenty-one".