21100651736 has 64 divisors (see below), whose sum is σ = 42336302400. Its totient is φ = 9824735232.

The previous prime is 21100651727. The next prime is 21100651777. The reversal of 21100651736 is 63715600112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5199020 + ... + 5203076.

It is an arithmetic number, because the mean of its divisors is an integer number (661504725).

Almost surely, 2^21100651736 is an apocalyptic number.

It is an amenable number.

21100651736 is an abundant number, since it is smaller than the sum of its proper divisors (21235650664).

21100651736 is a wasteful number, since it uses less digits than its factorization.

21100651736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4476 (or 4472 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The spelling of 21100651736 in words is "twenty-one billion, one hundred million, six hundred fifty-one thousand, seven hundred thirty-six".