21671050259 has 8 divisors (see below), whose sum is σ = 22538555952. Its totient is φ = 20820068640.

The previous prime is 21671050249. The next prime is 21671050301. The reversal of 21671050259 is 95205017612.

It is a happy number.

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 21671050259 - 2²⁸ = 21402614803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21671050249) 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, 4128344 + ... + 4133589.

It is an arithmetic number, because the mean of its divisors is an integer number (2817319494).

Almost surely, 2^21671050259 is an apocalyptic number.

21671050259 is a deficient number, since it is larger than the sum of its proper divisors (867505693).

21671050259 is an equidigital number, since it uses as much as digits as its factorization.

21671050259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8262037.

The product of its (nonzero) digits is 37800, while the sum is 38.

The spelling of 21671050259 in words is "twenty-one billion, six hundred seventy-one million, fifty thousand, two hundred fifty-nine".