21857611486697 has 8 divisors (see below), whose sum is σ = 26294870961600. Its totient is φ = 17749037898864.

The previous prime is 21857611486663. The next prime is 21857611486699. The reversal of 21857611486697 is 79668411675812.

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 21857611486697 - 2⁸ = 21857611486441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21857611486697.

It is not an unprimeable number, because it can be changed into a prime (21857611486699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82171471622 + ... + 82171471887.

It is an arithmetic number, because the mean of its divisors is an integer number (3286858870200).

Almost surely, 2^{21857611486697} is an apocalyptic number.

It is an amenable number.

21857611486697 is a deficient number, since it is larger than the sum of its proper divisors (4437259474903).

21857611486697 is a wasteful number, since it uses less digits than its factorization.

21857611486697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164342943535.

The product of its digits is 243855360, while the sum is 71.

The spelling of 21857611486697 in words is "twenty-one trillion, eight hundred fifty-seven billion, six hundred eleven million, four hundred eighty-six thousand, six hundred ninety-seven".