21777722422 has 4 divisors (see below), whose sum is σ = 32666583636. Its totient is φ = 10888861210.

The previous prime is 21777722359. The next prime is 21777722437. The reversal of 21777722422 is 22422777712.

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, 5444430604 + ... + 5444430607.

It is an arithmetic number, because the mean of its divisors is an integer number (8166645909).

Almost surely, 2^21777722422 is an apocalyptic number.

21777722422 is a deficient number, since it is larger than the sum of its proper divisors (10888861214).

21777722422 is a wasteful number, since it uses less digits than its factorization.

21777722422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10888861213.

The product of its digits is 307328, while the sum is 43.

The spelling of 21777722422 in words is "twenty-one billion, seven hundred seventy-seven million, seven hundred twenty-two thousand, four hundred twenty-two".