21357699966694 has 32 divisors (see below), whose sum is σ = 39713266172160. Its totient is φ = 8388414365472.

The previous prime is 21357699966683. The next prime is 21357699966751. The reversal of 21357699966694 is 49666999675312.

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, 422097004 + ... + 422147599.

It is an arithmetic number, because the mean of its divisors is an integer number (1241039567880).

Almost surely, 2^{21357699966694} is an apocalyptic number.

21357699966694 is a deficient number, since it is larger than the sum of its proper divisors (18355566205466).

21357699966694 is a wasteful number, since it uses less digits than its factorization.

21357699966694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844244764.

The product of its digits is 7142567040, while the sum is 82.

The spelling of 21357699966694 in words is "twenty-one trillion, three hundred fifty-seven billion, six hundred ninety-nine million, nine hundred sixty-six thousand, six hundred ninety-four".