21730835615 has 16 divisors (see below), whose sum is σ = 26228976768. Its totient is φ = 17283635616.

The previous prime is 21730835603. The next prime is 21730835641. The reversal of 21730835615 is 51653803712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21730835615 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 609512 + ... + 644178.

It is an arithmetic number, because the mean of its divisors is an integer number (1639311048).

Almost surely, 2^21730835615 is an apocalyptic number.

21730835615 is a deficient number, since it is larger than the sum of its proper divisors (4498141153).

21730835615 is a wasteful number, since it uses less digits than its factorization.

21730835615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35398.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 21730835615 in words is "twenty-one billion, seven hundred thirty million, eight hundred thirty-five thousand, six hundred fifteen".