21371845612 has 12 divisors (see below), whose sum is σ = 40277709136. Its totient is φ = 9863928720.

The previous prime is 21371845609. The next prime is 21371845619. The reversal of 21371845612 is 21654817312.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21371845619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205498464 + ... + 205498567.

Almost surely, 2^21371845612 is an apocalyptic number.

It is an amenable number.

21371845612 is a deficient number, since it is larger than the sum of its proper divisors (18905863524).

21371845612 is a wasteful number, since it uses less digits than its factorization.

21371845612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410997048 (or 410997046 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The spelling of 21371845612 in words is "twenty-one billion, three hundred seventy-one million, eight hundred forty-five thousand, six hundred twelve".