21231243371 has 8 divisors (see below), whose sum is σ = 22999710720. Its totient is φ = 19598068776.

The previous prime is 21231243349. The next prime is 21231243403. The reversal of 21231243371 is 17334213212.

It is not a de Polignac number, because 21231243371 - 2³⁰ = 20157501547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231243301) 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, 4829675 + ... + 4834068.

It is an arithmetic number, because the mean of its divisors is an integer number (2874963840).

Almost surely, 2^21231243371 is an apocalyptic number.

21231243371 is a deficient number, since it is larger than the sum of its proper divisors (1768467349).

21231243371 is an frugal number, since it uses more digits than its factorization.

21231243371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9663782 (or 9663756 counting only the distinct ones).

The product of its digits is 6048, while the sum is 29.

Adding to 21231243371 its reverse (17334213212), we get a palindrome (38565456583).

The spelling of 21231243371 in words is "twenty-one billion, two hundred thirty-one million, two hundred forty-three thousand, three hundred seventy-one".