21112404275 has 6 divisors (see below), whose sum is σ = 26179381332. Its totient is φ = 16889923400.

The previous prime is 21112404259. The next prime is 21112404307. The reversal of 21112404275 is 57240421112.

It is not a de Polignac number, because 21112404275 - 2⁴ = 21112404259 is a prime.

It is a super-2 number, since 2×21112404275² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 422248061 + ... + 422248110.

It is an arithmetic number, because the mean of its divisors is an integer number (4363230222).

Almost surely, 2^21112404275 is an apocalyptic number.

21112404275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21112404275 is a deficient number, since it is larger than the sum of its proper divisors (5066977057).

21112404275 is an equidigital number, since it uses as much as digits as its factorization.

21112404275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844496181 (or 844496176 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

Adding to 21112404275 its reverse (57240421112), we get a palindrome (78352825387).

The spelling of 21112404275 in words is "twenty-one billion, one hundred twelve million, four hundred four thousand, two hundred seventy-five".