21112122 has 8 divisors (see below), whose sum is σ = 42224256. Its totient is φ = 7037372.

The previous prime is 21112121. The next prime is 21112127. The reversal of 21112122 is 22121112.

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

21112122 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21112098 and 21112107.

It is not an unprimeable number, because it can be changed into a prime (21112121) 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, 1759338 + ... + 1759349.

It is an arithmetic number, because the mean of its divisors is an integer number (5278032).

Almost surely, 2^21112122 is an apocalyptic number.

21112122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21112122 is a wasteful number, since it uses less digits than its factorization.

21112122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518692.

The product of its digits is 16, while the sum is 12.

The square root of 21112122 is about 4594.7929224286. The cubic root of 21112122 is about 276.3825560410.

Adding to 21112122 its reverse (22121112), we get a palindrome (43233234).

The spelling of 21112122 in words is "twenty-one million, one hundred twelve thousand, one hundred twenty-two".