21628513336 has 16 divisors (see below), whose sum is σ = 40585950000. Its totient is φ = 10805593344.

The previous prime is 21628513307. The next prime is 21628513391. The reversal of 21628513336 is 63331582612.

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, 1072300 + ... + 1092283.

It is an arithmetic number, because the mean of its divisors is an integer number (2536621875).

Almost surely, 2^21628513336 is an apocalyptic number.

It is an amenable number.

21628513336 is a deficient number, since it is larger than the sum of its proper divisors (18957436664).

21628513336 is a wasteful number, since it uses less digits than its factorization.

21628513336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165838 (or 2165834 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The spelling of 21628513336 in words is "twenty-one billion, six hundred twenty-eight million, five hundred thirteen thousand, three hundred thirty-six".