21622663474 has 4 divisors (see below), whose sum is σ = 32433995214. Its totient is φ = 10811331736.

The previous prime is 21622663457. The next prime is 21622663487. The reversal of 21622663474 is 47436622612.

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., 20838943449 + 783720025 = 144357^2 + 27995^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21622663474.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5405665867 + ... + 5405665870.

Almost surely, 2^21622663474 is an apocalyptic number.

21622663474 is a deficient number, since it is larger than the sum of its proper divisors (10811331740).

21622663474 is a wasteful number, since it uses less digits than its factorization.

21622663474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10811331739.

The product of its digits is 580608, while the sum is 43.

The spelling of 21622663474 in words is "twenty-one billion, six hundred twenty-two million, six hundred sixty-three thousand, four hundred seventy-four".