21343180828 has 12 divisors (see below), whose sum is σ = 37351613152. Its totient is φ = 10671291360.

The previous prime is 21343180811. The next prime is 21343180841. The reversal of 21343180828 is 82808134312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189976 + ... + 280672.

Almost surely, 2^21343180828 is an apocalyptic number.

It is an amenable number.

21343180828 is a deficient number, since it is larger than the sum of its proper divisors (16008432324).

21343180828 is a wasteful number, since it uses less digits than its factorization.

21343180828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149532 (or 149530 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 21343180828 in words is "twenty-one billion, three hundred forty-three million, one hundred eighty thousand, eight hundred twenty-eight".