21452311331 has 4 divisors (see below), whose sum is σ = 23402521464. Its totient is φ = 19502101200.

The previous prime is 21452311313. The next prime is 21452311343. The reversal of 21452311331 is 13311325412.

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 21452311331 - 2¹⁰ = 21452310307 is a prime.

It is a super-2 number, since 2×21452311331² (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 21452311331.

It is not an unprimeable number, because it can be changed into a prime (21455311331) 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, 975105050 + ... + 975105071.

It is an arithmetic number, because the mean of its divisors is an integer number (5850630366).

Almost surely, 2^21452311331 is an apocalyptic number.

21452311331 is a deficient number, since it is larger than the sum of its proper divisors (1950210133).

21452311331 is a wasteful number, since it uses less digits than its factorization.

21452311331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950210132.

The product of its digits is 2160, while the sum is 26.

Adding to 21452311331 its reverse (13311325412), we get a palindrome (34763636743).

The spelling of 21452311331 in words is "twenty-one billion, four hundred fifty-two million, three hundred eleven thousand, three hundred thirty-one".