21917685362 has 4 divisors (see below), whose sum is σ = 32876528046. Its totient is φ = 10958842680.

The previous prime is 21917685347. The next prime is 21917685371. The reversal of 21917685362 is 26358671912.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 15398576281 + 6519109081 = 124091^2 + 80741^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21917685362.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5479421339 + ... + 5479421342.

Almost surely, 2^21917685362 is an apocalyptic number.

21917685362 is a deficient number, since it is larger than the sum of its proper divisors (10958842684).

21917685362 is a wasteful number, since it uses less digits than its factorization.

21917685362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10958842683.

The product of its digits is 1088640, while the sum is 50.

The spelling of 21917685362 in words is "twenty-one billion, nine hundred seventeen million, six hundred eighty-five thousand, three hundred sixty-two".