21622553 has 8 divisors (see below), whose sum is σ = 22882176. Its totient is φ = 20389600.

The previous prime is 21622543. The next prime is 21622571. The reversal of 21622553 is 35522612.

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 21622553 - 2¹⁶ = 21557017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21622543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4988 + ... + 8253.

It is an arithmetic number, because the mean of its divisors is an integer number (2860272).

Almost surely, 2^21622553 is an apocalyptic number.

21622553 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21622553 is a deficient number, since it is larger than the sum of its proper divisors (1259623).

21622553 is a wasteful number, since it uses less digits than its factorization.

21622553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13335.

The product of its digits is 3600, while the sum is 26.

The square root of 21622553 is about 4650.0056989212. The cubic root of 21622553 is about 278.5922238507.

The spelling of 21622553 in words is "twenty-one million, six hundred twenty-two thousand, five hundred fifty-three".