21453141331 has 4 divisors (see below), whose sum is σ = 21514612000. Its totient is φ = 21391670664.

The previous prime is 21453141317. The next prime is 21453141337. The reversal of 21453141331 is 13314135412.

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 21453141331 - 2¹¹ = 21453139283 is a prime.

It is a super-2 number, since 2×21453141331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21453141331.

It is not an unprimeable number, because it can be changed into a prime (21453141337) 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, 30734811 + ... + 30735508.

It is an arithmetic number, because the mean of its divisors is an integer number (5378653000).

Almost surely, 2^21453141331 is an apocalyptic number.

21453141331 is a deficient number, since it is larger than the sum of its proper divisors (61470669).

21453141331 is an equidigital number, since it uses as much as digits as its factorization.

21453141331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61470668.

The product of its digits is 4320, while the sum is 28.

Adding to 21453141331 its reverse (13314135412), we get a palindrome (34767276743).

The spelling of 21453141331 in words is "twenty-one billion, four hundred fifty-three million, one hundred forty-one thousand, three hundred thirty-one".