22421862721 has 4 divisors (see below), whose sum is σ = 22438837444. Its totient is φ = 22404888000.

The previous prime is 22421862679. The next prime is 22421862773. The reversal of 22421862721 is 12726812422.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10658291121 + 11763571600 = 103239^2 + 108460^2 .

It is a cyclic number.

It is not a de Polignac number, because 22421862721 - 2¹¹ = 22421860673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22421862521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8485380 + ... + 8488021.

It is an arithmetic number, because the mean of its divisors is an integer number (5609709361).

Almost surely, 2^22421862721 is an apocalyptic number.

It is an amenable number.

22421862721 is a deficient number, since it is larger than the sum of its proper divisors (16974723).

22421862721 is a wasteful number, since it uses less digits than its factorization.

22421862721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16974722.

The product of its digits is 43008, while the sum is 37.

The spelling of 22421862721 in words is "twenty-two billion, four hundred twenty-one million, eight hundred sixty-two thousand, seven hundred twenty-one".