21675674147 has 4 divisors (see below), whose sum is σ = 22261503216. Its totient is φ = 21089845080.

The previous prime is 21675674143. The next prime is 21675674149. The reversal of 21675674147 is 74147657612.

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 21675674147 - 2² = 21675674143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21675674095 and 21675674104.

It is not an unprimeable number, because it can be changed into a prime (21675674143) 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, 292914479 + ... + 292914552.

It is an arithmetic number, because the mean of its divisors is an integer number (5565375804).

Almost surely, 2^21675674147 is an apocalyptic number.

21675674147 is a deficient number, since it is larger than the sum of its proper divisors (585829069).

21675674147 is an equidigital number, since it uses as much as digits as its factorization.

21675674147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585829068.

The product of its digits is 1975680, while the sum is 50.

The spelling of 21675674147 in words is "twenty-one billion, six hundred seventy-five million, six hundred seventy-four thousand, one hundred forty-seven".