21536253149 has 8 divisors (see below), whose sum is σ = 21712558560. Its totient is φ = 21360128400.

The previous prime is 21536253073. The next prime is 21536253161. The reversal of 21536253149 is 94135263512.

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 21536253149 - 2²⁸ = 21267817693 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 (21536253049) 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, 199622 + ... + 287960.

It is an arithmetic number, because the mean of its divisors is an integer number (2714069820).

Almost surely, 2^21536253149 is an apocalyptic number.

It is an amenable number.

21536253149 is a deficient number, since it is larger than the sum of its proper divisors (176305411).

21536253149 is a wasteful number, since it uses less digits than its factorization.

21536253149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90331.

The product of its digits is 194400, while the sum is 41.

The spelling of 21536253149 in words is "twenty-one billion, five hundred thirty-six million, two hundred fifty-three thousand, one hundred forty-nine".