21260452823 has 4 divisors (see below), whose sum is σ = 21422746488. Its totient is φ = 21098159160.

The previous prime is 21260452813. The next prime is 21260452831. The reversal of 21260452823 is 32825406212.

It is a happy number.

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 21260452823 - 2⁸ = 21260452567 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 (21260452813) 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, 81146636 + ... + 81146897.

It is an arithmetic number, because the mean of its divisors is an integer number (5355686622).

Almost surely, 2^21260452823 is an apocalyptic number.

21260452823 is a deficient number, since it is larger than the sum of its proper divisors (162293665).

21260452823 is a wasteful number, since it uses less digits than its factorization.

21260452823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162293664.

The product of its (nonzero) digits is 46080, while the sum is 35.

The spelling of 21260452823 in words is "twenty-one billion, two hundred sixty million, four hundred fifty-two thousand, eight hundred twenty-three".