21623848605 has 24 divisors (see below), whose sum is σ = 39454041120. Its totient is φ = 10925733600.

The previous prime is 21623848573. The next prime is 21623848619. The reversal of 21623848605 is 50684832612.

21623848605 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 38 + 4 + 8 + 605 = 666.

It is not a de Polignac number, because 21623848605 - 2⁵ = 21623848573 is a prime.

It is a super-3 number, since 3×21623848605³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12644671 + ... + 12646380.

It is an arithmetic number, because the mean of its divisors is an integer number (1643918380).

Almost surely, 2^21623848605 is an apocalyptic number.

It is an amenable number.

21623848605 is a deficient number, since it is larger than the sum of its proper divisors (17830192515).

21623848605 is a wasteful number, since it uses less digits than its factorization.

21623848605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25291081 (or 25291078 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 21623848605 in words is "twenty-one billion, six hundred twenty-three million, eight hundred forty-eight thousand, six hundred five".