21619159 has 2 divisors, whose sum is σ = 21619160. Its totient is φ = 21619158.

The previous prime is 21619139. The next prime is 21619217. The reversal of 21619159 is 95191612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21619159 - 2⁵ = 21619127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21619109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10809579 + 10809580.

It is an arithmetic number, because the mean of its divisors is an integer number (10809580).

Almost surely, 2^21619159 is an apocalyptic number.

21619159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21619159 is an equidigital number, since it uses as much as digits as its factorization.

21619159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 34.

The square root of 21619159 is about 4649.6407388098. The cubic root of 21619159 is about 278.5776466099.

It can be divided in two parts, 2 and 1619159, that added together give a palindrome (1619161).

The spelling of 21619159 in words is "twenty-one million, six hundred nineteen thousand, one hundred fifty-nine".