21274159 has 2 divisors, whose sum is σ = 21274160. Its totient is φ = 21274158.

The previous prime is 21274133. The next prime is 21274163. The reversal of 21274159 is 95147212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21274159 - 2⁷ = 21274031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21274159.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21274109) 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, 10637079 + 10637080.

It is an arithmetic number, because the mean of its divisors is an integer number (10637080).

Almost surely, 2^21274159 is an apocalyptic number.

21274159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21274159 is an equidigital number, since it uses as much as digits as its factorization.

21274159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 31.

The square root of 21274159 is about 4612.3918957521. The cubic root of 21274159 is about 277.0878398322.

The spelling of 21274159 in words is "twenty-one million, two hundred seventy-four thousand, one hundred fifty-nine".