21364412828 has 24 divisors (see below), whose sum is σ = 41477909760. Its totient is φ = 9546500720.

The previous prime is 21364412819. The next prime is 21364412899. The reversal of 21364412828 is 82821446312.

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 7 ways as a sum of consecutive naturals, for example, 4112276 + ... + 4117467.

It is an arithmetic number, because the mean of its divisors is an integer number (1728246240).

Almost surely, 2^21364412828 is an apocalyptic number.

It is an amenable number.

21364412828 is a deficient number, since it is larger than the sum of its proper divisors (20113496932).

21364412828 is a wasteful number, since it uses less digits than its factorization.

21364412828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8229817 (or 8229815 counting only the distinct ones).

The product of its digits is 147456, while the sum is 41.

The spelling of 21364412828 in words is "twenty-one billion, three hundred sixty-four million, four hundred twelve thousand, eight hundred twenty-eight".