21091702097 has 8 divisors (see below), whose sum is σ = 21819735552. Its totient is φ = 20366647200.

The previous prime is 21091702087. The next prime is 21091702123. The reversal of 21091702097 is 79020719012.

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 21091702097 - 2⁴ = 21091702081 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 21091702097.

It is not an unprimeable number, because it can be changed into a prime (21091702067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 730229 + ... + 758562.

It is an arithmetic number, because the mean of its divisors is an integer number (2727466944).

Almost surely, 2^21091702097 is an apocalyptic number.

It is an amenable number.

21091702097 is a deficient number, since it is larger than the sum of its proper divisors (728033455).

21091702097 is a wasteful number, since it uses less digits than its factorization.

21091702097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489279.

The product of its (nonzero) digits is 15876, while the sum is 38.

The spelling of 21091702097 in words is "twenty-one billion, ninety-one million, seven hundred two thousand, ninety-seven".