21286298755 has 4 divisors (see below), whose sum is σ = 25543558512. Its totient is φ = 17029039000.

The previous prime is 21286298749. The next prime is 21286298767. The reversal of 21286298755 is 55789268212.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-21286298755 is a prime.

It is a super-2 number, since 2×21286298755² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21286298696 and 21286298705.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2128629871 + ... + 2128629880.

It is an arithmetic number, because the mean of its divisors is an integer number (6385889628).

Almost surely, 2^21286298755 is an apocalyptic number.

21286298755 is a deficient number, since it is larger than the sum of its proper divisors (4257259757).

21286298755 is an equidigital number, since it uses as much as digits as its factorization.

21286298755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4257259756.

The product of its digits is 4838400, while the sum is 55.

The spelling of 21286298755 in words is "twenty-one billion, two hundred eighty-six million, two hundred ninety-eight thousand, seven hundred fifty-five".