21777717022 has 4 divisors (see below), whose sum is σ = 32666575536. Its totient is φ = 10888858510.

The previous prime is 21777716993. The next prime is 21777717041. The reversal of 21777717022 is 22071777712.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21777717022.

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, 5444429254 + ... + 5444429257.

It is an arithmetic number, because the mean of its divisors is an integer number (8166643884).

Almost surely, 2^21777717022 is an apocalyptic number.

21777717022 is a deficient number, since it is larger than the sum of its proper divisors (10888858514).

21777717022 is a wasteful number, since it uses less digits than its factorization.

21777717022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10888858513.

The product of its (nonzero) digits is 134456, while the sum is 43.

The spelling of 21777717022 in words is "twenty-one billion, seven hundred seventy-seven million, seven hundred seventeen thousand, twenty-two".