22221001001 has 2 divisors, whose sum is σ = 22221001002. Its totient is φ = 22221001000.

The previous prime is 22221000983. The next prime is 22221001003. The reversal of 22221001001 is 10010012222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18877386025 + 3343614976 = 137395^2 + 57824^2 .

It is a cyclic number.

It is not a de Polignac number, because 22221001001 - 2⁶ = 22221000937 is a prime.

Together with 22221001003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22221001003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110500500 + 11110500501.

It is an arithmetic number, because the mean of its divisors is an integer number (11110500501).

Almost surely, 2^22221001001 is an apocalyptic number.

It is an amenable number.

22221001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221001001 is an equidigital number, since it uses as much as digits as its factorization.

22221001001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 22221001001 its reverse (10010012222), we get a palindrome (32231013223).

It can be divided in two parts, 2222 and 1001001, that multiplied together give a palindrome (2224224222).

The spelling of 22221001001 in words is "twenty-two billion, two hundred twenty-one million, one thousand, one".