21328026812 has 6 divisors (see below), whose sum is σ = 37324046928. Its totient is φ = 10664013404.

The previous prime is 21328026793. The next prime is 21328026827. The reversal of 21328026812 is 21862082312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2666003348 + ... + 2666003355.

It is an arithmetic number, because the mean of its divisors is an integer number (6220674488).

Almost surely, 2^21328026812 is an apocalyptic number.

It is an amenable number.

21328026812 is a deficient number, since it is larger than the sum of its proper divisors (15996020116).

21328026812 is a wasteful number, since it uses less digits than its factorization.

21328026812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5332006707 (or 5332006705 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The spelling of 21328026812 in words is "twenty-one billion, three hundred twenty-eight million, twenty-six thousand, eight hundred twelve".