222220002001021 has 2 divisors, whose sum is σ = 222220002001022. Its totient is φ = 222220002001020.

The previous prime is 222220002001007. The next prime is 222220002001043. The reversal of 222220002001021 is 120100200022222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112753710288025 + 109466291712996 = 10618555^2 + 10462614^2 .

It is a cyclic number.

It is not a de Polignac number, because 222220002001021 - 2¹⁷ = 222220001869949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222220002000986 and 222220002001004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222220002001001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110001000510 + 111110001000511.

It is an arithmetic number, because the mean of its divisors is an integer number (111110001000511).

Almost surely, 2^{222220002001021} is an apocalyptic number.

It is an amenable number.

222220002001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222220002001021 is an equidigital number, since it uses as much as digits as its factorization.

222220002001021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 222220002001021 its reverse (120100200022222), we get a palindrome (342320202023243).

The spelling of 222220002001021 in words is "two hundred twenty-two trillion, two hundred twenty billion, two million, one thousand, twenty-one".