21331130215 has 8 divisors (see below), whose sum is σ = 26080325568. Its totient is φ = 16742924640.

The previous prime is 21331130207. The next prime is 21331130257. The reversal of 21331130215 is 51203113312.

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

It is not a de Polignac number, because 21331130215 - 2³ = 21331130207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40247151 + ... + 40247680.

It is an arithmetic number, because the mean of its divisors is an integer number (3260040696).

Almost surely, 2^21331130215 is an apocalyptic number.

21331130215 is a deficient number, since it is larger than the sum of its proper divisors (4749195353).

21331130215 is an equidigital number, since it uses as much as digits as its factorization.

21331130215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80494889.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 21331130215 its reverse (51203113312), we get a palindrome (72534243527).

The spelling of 21331130215 in words is "twenty-one billion, three hundred thirty-one million, one hundred thirty thousand, two hundred fifteen".