21455053 has 4 divisors (see below), whose sum is σ = 21551488. Its totient is φ = 21358620.

The previous prime is 21455051. The next prime is 21455059. The reversal of 21455053 is 35055412.

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 21455053 - 2¹ = 21455051 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 (21455051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47883 + ... + 48328.

It is an arithmetic number, because the mean of its divisors is an integer number (5387872).

Almost surely, 2^21455053 is an apocalyptic number.

It is an amenable number.

21455053 is a deficient number, since it is larger than the sum of its proper divisors (96435).

21455053 is an equidigital number, since it uses as much as digits as its factorization.

21455053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96434.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 21455053 is about 4631.9599523312. The cubic root of 21455053 is about 277.8709828678.

The spelling of 21455053 in words is "twenty-one million, four hundred fifty-five thousand, fifty-three".