2212210021 has 4 divisors (see below), whose sum is σ = 2528240032. Its totient is φ = 1896180012.

The previous prime is 2212209991. The next prime is 2212210027. The reversal of 2212210021 is 1200122122.

It is a happy number.

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: 1200122122 = 2 ⋅600061061.

It is a cyclic number.

It is not a de Polignac number, because 2212210021 - 2⁷ = 2212209893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2212209983 and 2212210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212210027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158014995 + ... + 158015008.

It is an arithmetic number, because the mean of its divisors is an integer number (632060008).

Almost surely, 2^2212210021 is an apocalyptic number.

It is an amenable number.

2212210021 is a deficient number, since it is larger than the sum of its proper divisors (316030011).

2212210021 is an equidigital number, since it uses as much as digits as its factorization.

2212210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316030010.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2212210021 is about 47034.1367625685. The cubic root of 2212210021 is about 1302.9931075510.

Adding to 2212210021 its reverse (1200122122), we get a palindrome (3412332143).

The spelling of 2212210021 in words is "two billion, two hundred twelve million, two hundred ten thousand, twenty-one".