21517713622 has 4 divisors (see below), whose sum is σ = 32276570436. Its totient is φ = 10758856810.

The previous prime is 21517713593. The next prime is 21517713629. The reversal of 21517713622 is 22631771512.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21517713629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5379428404 + ... + 5379428407.

It is an arithmetic number, because the mean of its divisors is an integer number (8069142609).

Almost surely, 2^21517713622 is an apocalyptic number.

21517713622 is a deficient number, since it is larger than the sum of its proper divisors (10758856814).

21517713622 is a wasteful number, since it uses less digits than its factorization.

21517713622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10758856813.

The product of its digits is 35280, while the sum is 37.

The spelling of 21517713622 in words is "twenty-one billion, five hundred seventeen million, seven hundred thirteen thousand, six hundred twenty-two".