21099180709 has 8 divisors (see below), whose sum is σ = 23311627200. Its totient is φ = 18994658496.

The previous prime is 21099180701. The next prime is 21099180721. The reversal of 21099180709 is 90708199012.

It is a happy number.

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 21099180709 - 2³ = 21099180701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21099180701) 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, 26980659 + ... + 26981440.

It is an arithmetic number, because the mean of its divisors is an integer number (2913953400).

Almost surely, 2^21099180709 is an apocalyptic number.

It is an amenable number.

21099180709 is a deficient number, since it is larger than the sum of its proper divisors (2212446491).

21099180709 is a wasteful number, since it uses less digits than its factorization.

21099180709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53962139.

The product of its (nonzero) digits is 81648, while the sum is 46.

The spelling of 21099180709 in words is "twenty-one billion, ninety-nine million, one hundred eighty thousand, seven hundred nine".