2002222021 has 2 divisors, whose sum is σ = 2002222022. Its totient is φ = 2002222020.

The previous prime is 2002222009. The next prime is 2002222049. The reversal of 2002222021 is 1202222002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1923261025 + 78960996 = 43855^2 + 8886^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002222021 - 2²⁹ = 1465351109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2002221992 and 2002222010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2002222051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001111010 + 1001111011.

It is an arithmetic number, because the mean of its divisors is an integer number (1001111011).

Almost surely, 2^2002222021 is an apocalyptic number.

It is an amenable number.

2002222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002222021 is an equidigital number, since it uses as much as digits as its factorization.

2002222021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2002222021 is about 44746.1956036488. The cubic root of 2002222021 is about 1260.3874723759.

Adding to 2002222021 its reverse (1202222002), we get a palindrome (3204444023).

The spelling of 2002222021 in words is "two billion, two million, two hundred twenty-two thousand, twenty-one".