21310532453 has 4 divisors (see below), whose sum is σ = 24354894240. Its totient is φ = 18266170668.

The previous prime is 21310532443. The next prime is 21310532473. The reversal of 21310532453 is 35423501312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21310532453 - 2⁶ = 21310532389 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 (21310532413) 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, 1522180883 + ... + 1522180896.

It is an arithmetic number, because the mean of its divisors is an integer number (6088723560).

Almost surely, 2^21310532453 is an apocalyptic number.

It is an amenable number.

21310532453 is a deficient number, since it is larger than the sum of its proper divisors (3044361787).

21310532453 is an equidigital number, since it uses as much as digits as its factorization.

21310532453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044361786.

The product of its (nonzero) digits is 10800, while the sum is 29.

The spelling of 21310532453 in words is "twenty-one billion, three hundred ten million, five hundred thirty-two thousand, four hundred fifty-three".