21425159 has 8 divisors (see below), whose sum is σ = 24522240. Its totient is φ = 18337176.

The previous prime is 21425153. The next prime is 21425161. The reversal of 21425159 is 95152412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21425159 - 2²⁴ = 4647943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3902 + ... + 7620.

It is an arithmetic number, because the mean of its divisors is an integer number (3065280).

Almost surely, 2^21425159 is an apocalyptic number.

21425159 is a deficient number, since it is larger than the sum of its proper divisors (3097081).

21425159 is an equidigital number, since it uses as much as digits as its factorization.

21425159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4549.

The product of its digits is 3600, while the sum is 29.

The square root of 21425159 is about 4628.7318997756. The cubic root of 21425159 is about 277.7418674230.

The spelling of 21425159 in words is "twenty-one million, four hundred twenty-five thousand, one hundred fifty-nine".