21357699966695 has 8 divisors (see below), whose sum is σ = 26321922121344. Its totient is φ = 16624371865824.

The previous prime is 21357699966683. The next prime is 21357699966751. The reversal of 21357699966695 is 59666999675312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21357699966695 - 2¹⁰ = 21357699965671 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 7 ways as a sum of consecutive naturals, for example, 57723513239 + ... + 57723513608.

It is an arithmetic number, because the mean of its divisors is an integer number (3290240265168).

Almost surely, 2^{21357699966695} is an apocalyptic number.

21357699966695 is a deficient number, since it is larger than the sum of its proper divisors (4964222154649).

21357699966695 is a wasteful number, since it uses less digits than its factorization.

21357699966695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115447026889.

The product of its digits is 8928208800, while the sum is 83.

The spelling of 21357699966695 in words is "twenty-one trillion, three hundred fifty-seven billion, six hundred ninety-nine million, nine hundred sixty-six thousand, six hundred ninety-five".