21268715611 has 8 divisors (see below), whose sum is σ = 24987022704. Its totient is φ = 17847873120.

The previous prime is 21268715603. The next prime is 21268715647. The reversal of 21268715611 is 11651786212.

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

It is not a de Polignac number, because 21268715611 - 2³ = 21268715603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21268715711) 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, 74365996 + ... + 74366281.

It is an arithmetic number, because the mean of its divisors is an integer number (3123377838).

Almost surely, 2^21268715611 is an apocalyptic number.

21268715611 is a deficient number, since it is larger than the sum of its proper divisors (3718307093).

21268715611 is a wasteful number, since it uses less digits than its factorization.

21268715611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148732301.

The product of its digits is 40320, while the sum is 40.

The spelling of 21268715611 in words is "twenty-one billion, two hundred sixty-eight million, seven hundred fifteen thousand, six hundred eleven".