21135772297 has 8 divisors (see below), whose sum is σ = 21396080160. Its totient is φ = 20875599360.

The previous prime is 21135772253. The next prime is 21135772303. The reversal of 21135772297 is 79227753112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21135772297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21135778297) 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, 301897 + ... + 365257.

It is an arithmetic number, because the mean of its divisors is an integer number (2674510020).

Almost surely, 2^21135772297 is an apocalyptic number.

It is an amenable number.

21135772297 is a deficient number, since it is larger than the sum of its proper divisors (260307863).

21135772297 is an equidigital number, since it uses as much as digits as its factorization.

21135772297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67463.

The product of its digits is 370440, while the sum is 46.

The spelling of 21135772297 in words is "twenty-one billion, one hundred thirty-five million, seven hundred seventy-two thousand, two hundred ninety-seven".