21122453 has 4 divisors (see below), whose sum is σ = 23042688. Its totient is φ = 19202220.

The previous prime is 21122447. The next prime is 21122473. The reversal of 21122453 is 35422112.

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 21122453 - 2⁸ = 21122197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960101 + ... + 960122.

It is an arithmetic number, because the mean of its divisors is an integer number (5760672).

Almost surely, 2^21122453 is an apocalyptic number.

It is an amenable number.

21122453 is a deficient number, since it is larger than the sum of its proper divisors (1920235).

21122453 is a wasteful number, since it uses less digits than its factorization.

21122453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920234.

The product of its digits is 480, while the sum is 20.

The square root of 21122453 is about 4595.9169922878. The cubic root of 21122453 is about 276.4276303444.

Adding to 21122453 its reverse (35422112), we get a palindrome (56544565).

The spelling of 21122453 in words is "twenty-one million, one hundred twenty-two thousand, four hundred fifty-three".