21266845653 has 8 divisors (see below), whose sum is σ = 28463611968. Its totient is φ = 14123988224.

The previous prime is 21266845651. The next prime is 21266845709. The reversal of 21266845653 is 35654866212.

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 21266845653 - 2¹ = 21266845651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21266845651) 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, 13476300 + ... + 13477877.

It is an arithmetic number, because the mean of its divisors is an integer number (3557951496).

Almost surely, 2^21266845653 is an apocalyptic number.

It is an amenable number.

21266845653 is a deficient number, since it is larger than the sum of its proper divisors (7196766315).

21266845653 is a wasteful number, since it uses less digits than its factorization.

21266845653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26954443.

The product of its digits is 2073600, while the sum is 48.

The spelling of 21266845653 in words is "twenty-one billion, two hundred sixty-six million, eight hundred forty-five thousand, six hundred fifty-three".