21107324237 has 6 divisors (see below), whose sum is σ = 21810170574. Its totient is φ = 20426441880.

The previous prime is 21107324209. The next prime is 21107324239. The reversal of 21107324237 is 73242370112.

It can be written as a sum of positive squares in only one way, i.e., 20105538436 + 1001785801 = 141794^2 + 31651^2 .

It is not a de Polignac number, because 21107324237 - 2¹⁰ = 21107323213 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 (21107324239) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10980998 + ... + 10982919.

It is an arithmetic number, because the mean of its divisors is an integer number (3635028429).

Almost surely, 2^21107324237 is an apocalyptic number.

It is an amenable number.

21107324237 is a deficient number, since it is larger than the sum of its proper divisors (702846337).

21107324237 is an equidigital number, since it uses as much as digits as its factorization.

21107324237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21963979 (or 21963948 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

Adding to 21107324237 its reverse (73242370112), we get a palindrome (94349694349).

The spelling of 21107324237 in words is "twenty-one billion, one hundred seven million, three hundred twenty-four thousand, two hundred thirty-seven".