21622953 has 8 divisors (see below), whose sum is σ = 31451616. Its totient is φ = 13104800.

The previous prime is 21622927. The next prime is 21622957. The reversal of 21622953 is 35922612.

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 21622953 - 2¹⁴ = 21606569 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21622953.

It is not an unprimeable number, because it can be changed into a prime (21622957) 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, 327588 + ... + 327653.

It is an arithmetic number, because the mean of its divisors is an integer number (3931452).

Almost surely, 2^21622953 is an apocalyptic number.

It is an amenable number.

21622953 is a deficient number, since it is larger than the sum of its proper divisors (9828663).

21622953 is a wasteful number, since it uses less digits than its factorization.

21622953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655255.

The product of its digits is 6480, while the sum is 30.

The square root of 21622953 is about 4650.0487094223. The cubic root of 21622953 is about 278.5939417515.

It can be divided in two parts, 2162 and 2953, that added together give a palindrome (5115).

The spelling of 21622953 in words is "twenty-one million, six hundred twenty-two thousand, nine hundred fifty-three".