21131845413 has 8 divisors (see below), whose sum is σ = 32200907328. Its totient is φ = 12075340224.

The previous prime is 21131845351. The next prime is 21131845421. The reversal of 21131845413 is 31454813112.

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

It is not a de Polignac number, because 21131845413 - 2²⁰ = 21130796837 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131845433) 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, 503139156 + ... + 503139197.

It is an arithmetic number, because the mean of its divisors is an integer number (4025113416).

Almost surely, 2^21131845413 is an apocalyptic number.

It is an amenable number.

21131845413 is a deficient number, since it is larger than the sum of its proper divisors (11069061915).

21131845413 is a wasteful number, since it uses less digits than its factorization.

21131845413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006278363.

The product of its digits is 11520, while the sum is 33.

The spelling of 21131845413 in words is "twenty-one billion, one hundred thirty-one million, eight hundred forty-five thousand, four hundred thirteen".