2122021 has 8 divisors (see below), whose sum is σ = 2325600.
Its totient is φ = 1920240.
The previous prime is 2122013. The next prime is 2122031. The reversal of 2122021 is 1202212.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 2122021 - 23 = 2122013 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 2121989 and 2122007.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2122031) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3915 + ... + 4423.
It is an arithmetic number, because the mean of its divisors is an integer number (290700).
22122021 is an apocalyptic number.
It is an amenable number.
2122021 is a deficient number, since it is larger than the sum of its proper divisors (203579).
2122021 is a wasteful number, since it uses less digits than its factorization.
2122021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 899.
The product of its (nonzero) digits is 16, while the sum is 10.
The square root of 2122021 is about 1456.7158267830.
The cubic root of 2122021 is about 128.5039741992.
Adding to 2122021 its reverse (1202212), we get a palindrome (3324233).
The spelling of 2122021 in words is "two million, one hundred twenty-two thousand, twenty-one".