21358027 has 2 divisors, whose sum is σ = 21358028. Its totient is φ = 21358026.

The previous prime is 21358019. The next prime is 21358031. The reversal of 21358027 is 72085312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21358027 - 2³ = 21358019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21357986 and 21358004.

It is not a weakly prime, because it can be changed into another prime (21358037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10679013 + 10679014.

It is an arithmetic number, because the mean of its divisors is an integer number (10679014).

Almost surely, 2^21358027 is an apocalyptic number.

21358027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21358027 is an equidigital number, since it uses as much as digits as its factorization.

21358027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 21358027 is about 4621.4745482367. The cubic root of 21358027 is about 277.4514786793.

The spelling of 21358027 in words is "twenty-one million, three hundred fifty-eight thousand, twenty-seven".