21655364606422 has 4 divisors (see below), whose sum is σ = 32483046909636. Its totient is φ = 10827682303210.

The previous prime is 21655364606417. The next prime is 21655364606441. The reversal of 21655364606422 is 22460646355612.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21655364606422.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5413841151604 + ... + 5413841151607.

It is an arithmetic number, because the mean of its divisors is an integer number (8120761727409).

Almost surely, 2^{21655364606422} is an apocalyptic number.

21655364606422 is a deficient number, since it is larger than the sum of its proper divisors (10827682303214).

21655364606422 is a wasteful number, since it uses less digits than its factorization.

21655364606422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10827682303213.

The product of its (nonzero) digits is 12441600, while the sum is 52.

The spelling of 21655364606422 in words is "twenty-one trillion, six hundred fifty-five billion, three hundred sixty-four million, six hundred six thousand, four hundred twenty-two".