21622153 has 4 divisors (see below), whose sum is σ = 24711040. Its totient is φ = 18533268.

The previous prime is 21622151. The next prime is 21622157. The reversal of 21622153 is 35122612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21622153 - 2¹ = 21622151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21622151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1544433 + ... + 1544446.

It is an arithmetic number, because the mean of its divisors is an integer number (6177760).

Almost surely, 2^21622153 is an apocalyptic number.

It is an amenable number.

21622153 is a deficient number, since it is larger than the sum of its proper divisors (3088887).

21622153 is an equidigital number, since it uses as much as digits as its factorization.

21622153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3088886.

The product of its digits is 720, while the sum is 22.

The square root of 21622153 is about 4649.9626880223. The cubic root of 21622153 is about 278.5905059287.

Adding to 21622153 its reverse (35122612), we get a palindrome (56744765).

The spelling of 21622153 in words is "twenty-one million, six hundred twenty-two thousand, one hundred fifty-three".