21448372823 has 8 divisors (see below), whose sum is σ = 21492925920. Its totient is φ = 21403867680.

The previous prime is 21448372807. The next prime is 21448372859. The reversal of 21448372823 is 32827384412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21448372823 - 2⁴ = 21448372807 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 (21448377823) 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, 964061 + ... + 986057.

It is an arithmetic number, because the mean of its divisors is an integer number (2686615740).

Almost surely, 2^21448372823 is an apocalyptic number.

21448372823 is a deficient number, since it is larger than the sum of its proper divisors (44553097).

21448372823 is a wasteful number, since it uses less digits than its factorization.

21448372823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23977.

The product of its digits is 516096, while the sum is 44.

The spelling of 21448372823 in words is "twenty-one billion, four hundred forty-eight million, three hundred seventy-two thousand, eight hundred twenty-three".