21454138 has 8 divisors (see below), whose sum is σ = 32221332. Its totient is φ = 10713696.

The previous prime is 21454123. The next prime is 21454151. The reversal of 21454138 is 83145412.

It can be written as a sum of positive squares in 2 ways, for example, as 16104169 + 5349969 = 4013^2 + 2313^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4545 + ... + 7972.

Almost surely, 2^21454138 is an apocalyptic number.

21454138 is a deficient number, since it is larger than the sum of its proper divisors (10767194).

21454138 is a wasteful number, since it uses less digits than its factorization.

21454138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13376.

The product of its digits is 3840, while the sum is 28.

The square root of 21454138 is about 4631.8611809941. The cubic root of 21454138 is about 277.8670326629.

The spelling of 21454138 in words is "twenty-one million, four hundred fifty-four thousand, one hundred thirty-eight".