21264646611 has 8 divisors (see below), whose sum is σ = 30533851600. Its totient is φ = 13085936352.

The previous prime is 21264646603. The next prime is 21264646649. The reversal of 21264646611 is 11664646212.

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

It is not a de Polignac number, because 21264646611 - 2³ = 21264646603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 545247349 = 21264646611 / (2 + 1 + 2 + 6 + 4 + 6 + 4 + 6 + 6 + 1 + 1).

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 21264646611.

It is not an unprimeable number, because it can be changed into a prime (21264646661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272623636 + ... + 272623713.

It is an arithmetic number, because the mean of its divisors is an integer number (3816731450).

Almost surely, 2^21264646611 is an apocalyptic number.

21264646611 is a deficient number, since it is larger than the sum of its proper divisors (9269204989).

21264646611 is a wasteful number, since it uses less digits than its factorization.

21264646611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545247365.

The product of its digits is 82944, while the sum is 39.

The spelling of 21264646611 in words is "twenty-one billion, two hundred sixty-four million, six hundred forty-six thousand, six hundred eleven".