21872453 has 8 divisors (see below), whose sum is σ = 22634496. Its totient is φ = 21114000.

The previous prime is 21872449. The next prime is 21872483. The reversal of 21872453 is 35427812.

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 21872453 - 2² = 21872449 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 (21872413) 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, 18428 + ... + 19578.

It is an arithmetic number, because the mean of its divisors is an integer number (2829312).

Almost surely, 2^21872453 is an apocalyptic number.

It is an amenable number.

21872453 is a deficient number, since it is larger than the sum of its proper divisors (762043).

21872453 is a wasteful number, since it uses less digits than its factorization.

21872453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795.

The product of its digits is 13440, while the sum is 32.

The square root of 21872453 is about 4676.7994397879. The cubic root of 21872453 is about 279.6613806201.

The spelling of 21872453 in words is "twenty-one million, eight hundred seventy-two thousand, four hundred fifty-three".