21674335427 has 4 divisors (see below), whose sum is σ = 21674974896. Its totient is φ = 21673695960.

The previous prime is 21674335391. The next prime is 21674335439. The reversal of 21674335427 is 72453347612.

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 21674335427 - 2¹⁰ = 21674334403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21674335477) 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, 265868 + ... + 337689.

It is an arithmetic number, because the mean of its divisors is an integer number (5418743724).

Almost surely, 2^21674335427 is an apocalyptic number.

21674335427 is a deficient number, since it is larger than the sum of its proper divisors (639469).

21674335427 is an equidigital number, since it uses as much as digits as its factorization.

21674335427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639468.

The product of its digits is 846720, while the sum is 44.

The spelling of 21674335427 in words is "twenty-one billion, six hundred seventy-four million, three hundred thirty-five thousand, four hundred twenty-seven".