21454627 has 4 divisors (see below), whose sum is σ = 21748600. Its totient is φ = 21160656.

The previous prime is 21454621. The next prime is 21454637. The reversal of 21454627 is 72645412.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-21454627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21454621) 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, 146877 + ... + 147022.

It is an arithmetic number, because the mean of its divisors is an integer number (5437150).

Almost surely, 2^21454627 is an apocalyptic number.

21454627 is a deficient number, since it is larger than the sum of its proper divisors (293973).

21454627 is an equidigital number, since it uses as much as digits as its factorization.

21454627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293972.

The product of its digits is 13440, while the sum is 31.

The square root of 21454627 is about 4631.9139672494. The cubic root of 21454627 is about 277.8691437700.

The spelling of 21454627 in words is "twenty-one million, four hundred fifty-four thousand, six hundred twenty-seven".