1221002200087 has 2 divisors, whose sum is σ = 1221002200088. Its totient is φ = 1221002200086.

The previous prime is 1221002200081. The next prime is 1221002200139. The reversal of 1221002200087 is 7800022001221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221002200087 - 2³¹ = 1218854716439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221002200081) 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 as a sum of consecutive naturals, namely, 610501100043 + 610501100044.

It is an arithmetic number, because the mean of its divisors is an integer number (610501100044).

Almost surely, 2^{1221002200087} is an apocalyptic number.

1221002200087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002200087 is an equidigital number, since it uses as much as digits as its factorization.

1221002200087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

The spelling of 1221002200087 in words is "one trillion, two hundred twenty-one billion, two million, two hundred thousand, eighty-seven".