21415159 has 2 divisors, whose sum is σ = 21415160. Its totient is φ = 21415158.

The previous prime is 21415153. The next prime is 21415181. The reversal of 21415159 is 95151412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21415159 - 2¹³ = 21406967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21415153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707579 + 10707580.

It is an arithmetic number, because the mean of its divisors is an integer number (10707580).

Almost surely, 2^21415159 is an apocalyptic number.

21415159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21415159 is an equidigital number, since it uses as much as digits as its factorization.

21415159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 28.

The square root of 21415159 is about 4627.6515642386. The cubic root of 21415159 is about 277.6986495267.

The spelling of 21415159 in words is "twenty-one million, four hundred fifteen thousand, one hundred fifty-nine".