21260665045 has 8 divisors (see below), whose sum is σ = 25945218720. Its totient is φ = 16720251600.

The previous prime is 21260665031. The next prime is 21260665109. The reversal of 21260665045 is 54056606212.

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

It is not a de Polignac number, because 21260665045 - 2⁹ = 21260664533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21260664995 and 21260665013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36034731 + ... + 36035320.

It is an arithmetic number, because the mean of its divisors is an integer number (3243152340).

Almost surely, 2^21260665045 is an apocalyptic number.

It is an amenable number.

21260665045 is a deficient number, since it is larger than the sum of its proper divisors (4684553675).

21260665045 is an equidigital number, since it uses as much as digits as its factorization.

21260665045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72070115.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 21260665045 in words is "twenty-one billion, two hundred sixty million, six hundred sixty-five thousand, forty-five".