21936868322 has 4 divisors (see below), whose sum is σ = 32905302486. Its totient is φ = 10968434160.

The previous prime is 21936868297. The next prime is 21936868351. The reversal of 21936868322 is 22386863912.

It is a Cunningham number, because it is equal to 148111²+1.

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., 21936868321 + 1 = 148111^2 + 1^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5484217079 + ... + 5484217082.

Almost surely, 2^21936868322 is an apocalyptic number.

21936868322 is a deficient number, since it is larger than the sum of its proper divisors (10968434164).

21936868322 is a wasteful number, since it uses less digits than its factorization.

21936868322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10968434163.

The product of its digits is 1492992, while the sum is 50.

The spelling of 21936868322 in words is "twenty-one billion, nine hundred thirty-six million, eight hundred sixty-eight thousand, three hundred twenty-two".