21274027 has 2 divisors, whose sum is σ = 21274028. Its totient is φ = 21274026.

The previous prime is 21274009. The next prime is 21274031. The reversal of 21274027 is 72047212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21274027 - 2⁷ = 21273899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21273992 and 21274010.

It is not a weakly prime, because it can be changed into another prime (21274037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10637013 + 10637014.

It is an arithmetic number, because the mean of its divisors is an integer number (10637014).

Almost surely, 2^21274027 is an apocalyptic number.

21274027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21274027 is an equidigital number, since it uses as much as digits as its factorization.

21274027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 21274027 is about 4612.3775864515. The cubic root of 21274027 is about 277.0872667478.

The spelling of 21274027 in words is "twenty-one million, two hundred seventy-four thousand, twenty-seven".