21987392222 has 4 divisors (see below), whose sum is σ = 32981088336. Its totient is φ = 10993696110.

The previous prime is 21987392213. The next prime is 21987392237. The reversal of 21987392222 is 22229378912.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5496848054 + ... + 5496848057.

It is an arithmetic number, because the mean of its divisors is an integer number (8245272084).

Almost surely, 2^21987392222 is an apocalyptic number.

21987392222 is a deficient number, since it is larger than the sum of its proper divisors (10993696114).

21987392222 is a wasteful number, since it uses less digits than its factorization.

21987392222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10993696113.

The product of its digits is 435456, while the sum is 47.

The spelling of 21987392222 in words is "twenty-one billion, nine hundred eighty-seven million, three hundred ninety-two thousand, two hundred twenty-two".