11212021 has 4 divisors (see below), whose sum is σ = 11239200.
Its totient is φ = 11184844.
The previous prime is 11212013. The next prime is 11212037. The reversal of 11212021 is 12021211.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12021211 = 31 ⋅387781.
It is a cyclic number.
It is not a de Polignac number, because 11212021 - 23 = 11212013 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 11211989 and 11212007.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (11212001) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12961 + ... + 13798.
It is an arithmetic number, because the mean of its divisors is an integer number (2809800).
Almost surely, 211212021 is an apocalyptic number.
It is an amenable number.
11212021 is a deficient number, since it is larger than the sum of its proper divisors (27179).
11212021 is an equidigital number, since it uses as much as digits as its factorization.
11212021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 27178.
The product of its (nonzero) digits is 8, while the sum is 10.
The square root of 11212021 is about 3348.4356048758.
The cubic root of 11212021 is about 223.8178059845.
Adding to 11212021 its reverse (12021211), we get a palindrome (23233232).
The spelling of 11212021 in words is "eleven million, two hundred twelve thousand, twenty-one".