21097097611 has 8 divisors (see below), whose sum is σ = 21597730880. Its totient is φ = 20596919112.

The previous prime is 21097097587. The next prime is 21097097629. The reversal of 21097097611 is 11679079012.

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 21097097611 - 2⁵ = 21097097579 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21097097641) 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, 18885 + ... + 206278.

It is an arithmetic number, because the mean of its divisors is an integer number (2699716360).

Almost surely, 2^21097097611 is an apocalyptic number.

21097097611 is a deficient number, since it is larger than the sum of its proper divisors (500633269).

21097097611 is a wasteful number, since it uses less digits than its factorization.

21097097611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227385.

The product of its (nonzero) digits is 47628, while the sum is 43.

The spelling of 21097097611 in words is "twenty-one billion, ninety-seven million, ninety-seven thousand, six hundred eleven".