21627458 has 4 divisors (see below), whose sum is σ = 32441190. Its totient is φ = 10813728.

The previous prime is 21627457. The next prime is 21627461. The reversal of 21627458 is 85472612.

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

It can be written as a sum of positive squares in only one way, i.e., 20097289 + 1530169 = 4483^2 + 1237^2 .

It is not an unprimeable number, because it can be changed into a prime (21627457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5406863 + ... + 5406866.

Almost surely, 2^21627458 is an apocalyptic number.

21627458 is a deficient number, since it is larger than the sum of its proper divisors (10813732).

21627458 is a wasteful number, since it uses less digits than its factorization.

21627458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10813731.

The product of its digits is 26880, while the sum is 35.

The square root of 21627458 is about 4650.5330877223. The cubic root of 21627458 is about 278.6132881463.

The spelling of 21627458 in words is "twenty-one million, six hundred twenty-seven thousand, four hundred fifty-eight".