21457627 has 2 divisors, whose sum is σ = 21457628. Its totient is φ = 21457626.

The previous prime is 21457603. The next prime is 21457649. The reversal of 21457627 is 72675412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21457627 - 2²³ = 13069019 is a prime.

It is a super-2 number, since 2×21457627² = 920859512942258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21457592 and 21457601.

It is not a weakly prime, because it can be changed into another prime (21457687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10728813 + 10728814.

It is an arithmetic number, because the mean of its divisors is an integer number (10728814).

Almost surely, 2^21457627 is an apocalyptic number.

21457627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21457627 is an equidigital number, since it uses as much as digits as its factorization.

21457627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 34.

The square root of 21457627 is about 4632.2377961413. The cubic root of 21457627 is about 277.8820946450.

The spelling of 21457627 in words is "twenty-one million, four hundred fifty-seven thousand, six hundred twenty-seven".