21112122329 has 4 divisors (see below), whose sum is σ = 21163741620. Its totient is φ = 21060503040.

The previous prime is 21112122319. The next prime is 21112122331. The reversal of 21112122329 is 92322121112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20562126025 + 549996304 = 143395^2 + 23452^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112122329 - 2²⁸ = 20843686873 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112122298 and 21112122307.

It is not an unprimeable number, because it can be changed into a prime (21112122319) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 25809032 + ... + 25809849.

It is an arithmetic number, because the mean of its divisors is an integer number (5290935405).

Almost surely, 2^21112122329 is an apocalyptic number.

It is an amenable number.

21112122329 is a deficient number, since it is larger than the sum of its proper divisors (51619291).

21112122329 is an equidigital number, since it uses as much as digits as its factorization.

21112122329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51619290.

The product of its digits is 864, while the sum is 26.

The spelling of 21112122329 in words is "twenty-one billion, one hundred twelve million, one hundred twenty-two thousand, three hundred twenty-nine".