21837315919 has 4 divisors (see below), whose sum is σ = 21837666240. Its totient is φ = 21836965600.

The previous prime is 21837315893. The next prime is 21837315943. The reversal of 21837315919 is 91951373812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21837315919 - 2⁷ = 21837315791 is a prime.

It is a super-2 number, since 2×21837315919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21837315319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53482 + ... + 215719.

It is an arithmetic number, because the mean of its divisors is an integer number (5459416560).

Almost surely, 2^21837315919 is an apocalyptic number.

21837315919 is a deficient number, since it is larger than the sum of its proper divisors (350321).

21837315919 is an equidigital number, since it uses as much as digits as its factorization.

21837315919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350320.

The product of its digits is 408240, while the sum is 49.

The spelling of 21837315919 in words is "twenty-one billion, eight hundred thirty-seven million, three hundred fifteen thousand, nine hundred nineteen".