21646674603 has 16 divisors (see below), whose sum is σ = 32072954400. Its totient is φ = 14429403360.

The previous prime is 21646674589. The next prime is 21646674631. The reversal of 21646674603 is 30647664612.

It is a happy number.

It is not a de Polignac number, because 21646674603 - 2⁴ = 21646674587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21646674683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209293 + ... + 295121.

It is an arithmetic number, because the mean of its divisors is an integer number (2004559650).

Almost surely, 2^21646674603 is an apocalyptic number.

21646674603 is a deficient number, since it is larger than the sum of its proper divisors (10426279797).

21646674603 is an equidigital number, since it uses as much as digits as its factorization.

21646674603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95179 (or 95173 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 45.

Subtracting 21646674603 from its reverse (30647664612), we obtain a palindrome (9000990009).

The spelling of 21646674603 in words is "twenty-one billion, six hundred forty-six million, six hundred seventy-four thousand, six hundred three".