21722455 has 8 divisors (see below), whose sum is σ = 26106912. Its totient is φ = 17351328.

The previous prime is 21722429. The next prime is 21722483. The reversal of 21722455 is 55422712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21722455 - 2⁵ = 21722423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702 + ... + 6628.

It is an arithmetic number, because the mean of its divisors is an integer number (3263364).

Almost surely, 2^21722455 is an apocalyptic number.

21722455 is a deficient number, since it is larger than the sum of its proper divisors (4384457).

21722455 is an equidigital number, since it uses as much as digits as its factorization.

21722455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6665.

The product of its digits is 5600, while the sum is 28.

The square root of 21722455 is about 4660.7354569853. The cubic root of 21722455 is about 279.0206217120.

The spelling of 21722455 in words is "twenty-one million, seven hundred twenty-two thousand, four hundred fifty-five".