2001222221087 has 2 divisors, whose sum is σ = 2001222221088. Its totient is φ = 2001222221086.

The previous prime is 2001222221069. The next prime is 2001222221161. The reversal of 2001222221087 is 7801222221002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001222221087 - 2¹⁴ = 2001222204703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001222221987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000611110543 + 1000611110544.

It is an arithmetic number, because the mean of its divisors is an integer number (1000611110544).

Almost surely, 2^{2001222221087} is an apocalyptic number.

2001222221087 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001222221087 is an equidigital number, since it uses as much as digits as its factorization.

2001222221087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 29.

Adding to 2001222221087 its reverse (7801222221002), we get a palindrome (9802444442089).

The spelling of 2001222221087 in words is "two trillion, one billion, two hundred twenty-two million, two hundred twenty-one thousand, eighty-seven".