21385627 has 2 divisors, whose sum is σ = 21385628. Its totient is φ = 21385626.

The previous prime is 21385603. The next prime is 21385633. The reversal of 21385627 is 72658312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21385627 - 2¹⁹ = 20861339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21385592 and 21385601.

It is not a weakly prime, because it can be changed into another prime (21385327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10692813 + 10692814.

It is an arithmetic number, because the mean of its divisors is an integer number (10692814).

Almost surely, 2^21385627 is an apocalyptic number.

21385627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21385627 is an equidigital number, since it uses as much as digits as its factorization.

21385627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 21385627 is about 4624.4596441098. The cubic root of 21385627 is about 277.5709398485.

The spelling of 21385627 in words is "twenty-one million, three hundred eighty-five thousand, six hundred twenty-seven".