21642304605 has 8 divisors (see below), whose sum is σ = 34627687392. Its totient is φ = 11542562448.

The previous prime is 21642304583. The next prime is 21642304627. The reversal of 21642304605 is 50640324612.

It is an interprime number because it is at equal distance from previous prime (21642304583) and next prime (21642304627).

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

It is not a de Polignac number, because 21642304605 - 2¹⁰ = 21642303581 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 721410139 + ... + 721410168.

It is an arithmetic number, because the mean of its divisors is an integer number (4328460924).

Almost surely, 2^21642304605 is an apocalyptic number.

It is an amenable number.

21642304605 is a deficient number, since it is larger than the sum of its proper divisors (12985382787).

21642304605 is a wasteful number, since it uses less digits than its factorization.

21642304605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442820315.

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 21642304605 in words is "twenty-one billion, six hundred forty-two million, three hundred four thousand, six hundred five".