21121112 has 8 divisors (see below), whose sum is σ = 39602100.
Its totient is φ = 10560552.
The previous prime is 21121099. The next prime is 21121129. The reversal of 21121112 is 21112112.
It is a tau number, because it is divible by the number of its divisors (8).
It is a super-2 number, since 2×211211122 = 892202744233088, which contains 22 as substring.
It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.
It is a junction number, because it is equal to n+sod(n) for n = 21121093 and 21121102.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320062 + ... + 1320077.
Almost surely, 221121112 is an apocalyptic number.
It is an amenable number.
21121112 is a deficient number, since it is larger than the sum of its proper divisors (18480988).
21121112 is a wasteful number, since it uses less digits than its factorization.
21121112 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2640145 (or 2640141 counting only the distinct ones).
The product of its digits is 8, while the sum is 11.
The square root of 21121112 is about 4595.7710996089.
The cubic root of 21121112 is about 276.4217803720.
Adding to 21121112 its reverse (21112112), we get a palindrome (42233224).
The spelling of 21121112 in words is "twenty-one million, one hundred twenty-one thousand, one hundred twelve".