2202021 has 6 divisors (see below), whose sum is σ = 3180710.
Its totient is φ = 1468008.
The previous prime is 2202019. The next prime is 2202029. The reversal of 2202021 is 1202022.
Adding to 2202021 its reverse (1202022), we get a palindrome (3404043).
Subtracting from 2202021 its reverse (1202022), we obtain a palindrome (999999).
It can be written as a sum of positive squares in only one way, i.e., 2030625 + 171396 = 1425^2 + 414^2
It is not a de Polignac number, because 2202021 - 21 = 2202019 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 244669 = 2202021 / (2 + 2 + 0 + 2 + 0 + 2 + 1).
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 2201994 and 2202012.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2202029) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 122326 + ... + 122343.
22202021 is an apocalyptic number.
It is an amenable number.
2202021 is a deficient number, since it is larger than the sum of its proper divisors (978689).
2202021 is a wasteful number, since it uses less digits than its factorization.
2202021 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 244675 (or 244672 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 9.
The square root of 2202021 is about 1483.9208199901.
The cubic root of 2202021 is about 130.0989581828.
The spelling of 2202021 in words is "two million, two hundred two thousand, twenty-one".