21092808653 has 4 divisors (see below), whose sum is σ = 24106067040. Its totient is φ = 18079550268.

The previous prime is 21092808617. The next prime is 21092808677. The reversal of 21092808653 is 35680829012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21092808653 - 2²⁶ = 21025699789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21092808353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1506629183 + ... + 1506629196.

It is an arithmetic number, because the mean of its divisors is an integer number (6026516760).

Almost surely, 2^21092808653 is an apocalyptic number.

It is an amenable number.

21092808653 is a deficient number, since it is larger than the sum of its proper divisors (3013258387).

21092808653 is an equidigital number, since it uses as much as digits as its factorization.

21092808653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3013258386.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 21092808653 in words is "twenty-one billion, ninety-two million, eight hundred eight thousand, six hundred fifty-three".