21456254 has 4 divisors (see below), whose sum is σ = 32184384. Its totient is φ = 10728126.

The previous prime is 21456251. The next prime is 21456257. The reversal of 21456254 is 45265412.

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

It is an interprime number because it is at equal distance from previous prime (21456251) and next prime (21456257).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21456251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5364062 + ... + 5364065.

It is an arithmetic number, because the mean of its divisors is an integer number (8046096).

Almost surely, 2^21456254 is an apocalyptic number.

21456254 is a deficient number, since it is larger than the sum of its proper divisors (10728130).

21456254 is a wasteful number, since it uses less digits than its factorization.

21456254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10728129.

The product of its digits is 9600, while the sum is 29.

The square root of 21456254 is about 4632.0895932613. The cubic root of 21456254 is about 277.8761676111.

The spelling of 21456254 in words is "twenty-one million, four hundred fifty-six thousand, two hundred fifty-four".