222222000002021 has 2 divisors, whose sum is σ = 222222000002022. Its totient is φ = 222222000002020.

The previous prime is 222222000001949. The next prime is 222222000002047. The reversal of 222222000002021 is 120200000222222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210475854621796 + 11746145380225 = 14507786^2 + 3427265^2 .

It is a cyclic number.

It is not a de Polignac number, because 222222000002021 - 2¹⁰ = 222222000000997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222222000005021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111111000001010 + 111111000001011.

It is an arithmetic number, because the mean of its divisors is an integer number (111111000001011).

Almost surely, 2^{222222000002021} is an apocalyptic number.

It is an amenable number.

222222000002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222222000002021 is an equidigital number, since it uses as much as digits as its factorization.

222222000002021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 222222000002021 its reverse (120200000222222), we get a palindrome (342422000224243).

The spelling of 222222000002021 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, two thousand, twenty-one".