21475453 has 4 divisors (see below), whose sum is σ = 22605760. Its totient is φ = 20345148.

The previous prime is 21475451. The next prime is 21475459. The reversal of 21475453 is 35457412.

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 21475453 - 2¹ = 21475451 is a prime.

It is a super-2 number, since 2×21475453² = 922390163110418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475451) 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, 565125 + ... + 565162.

It is an arithmetic number, because the mean of its divisors is an integer number (5651440).

Almost surely, 2^21475453 is an apocalyptic number.

It is an amenable number.

21475453 is a deficient number, since it is larger than the sum of its proper divisors (1130307).

21475453 is a wasteful number, since it uses less digits than its factorization.

21475453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130306.

The product of its digits is 16800, while the sum is 31.

The square root of 21475453 is about 4634.1615207068. The cubic root of 21475453 is about 277.9590238590.

The spelling of 21475453 in words is "twenty-one million, four hundred seventy-five thousand, four hundred fifty-three".