21702001888687 has 2 divisors, whose sum is σ = 21702001888688. Its totient is φ = 21702001888686.

The previous prime is 21702001888597. The next prime is 21702001888741. The reversal of 21702001888687 is 78688810020712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21702001888687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21702001888187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10851000944343 + 10851000944344.

It is an arithmetic number, because the mean of its divisors is an integer number (10851000944344).

Almost surely, 2^{21702001888687} is an apocalyptic number.

21702001888687 is a deficient number, since it is larger than the sum of its proper divisors (1).

21702001888687 is an equidigital number, since it uses as much as digits as its factorization.

21702001888687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4816896, while the sum is 58.

The spelling of 21702001888687 in words is "twenty-one trillion, seven hundred two billion, one million, eight hundred eighty-eight thousand, six hundred eighty-seven".