1221022202087 has 2 divisors, whose sum is σ = 1221022202088. Its totient is φ = 1221022202086.

The previous prime is 1221022202063. The next prime is 1221022202119. The reversal of 1221022202087 is 7802022201221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221022202087 - 2²⁶ = 1220955093223 is a prime.

It is a super-4 number, since 4×1221022202087⁴ (a number of 49 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221022202047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610511101043 + 610511101044.

It is an arithmetic number, because the mean of its divisors is an integer number (610511101044).

Almost surely, 2^{1221022202087} is an apocalyptic number.

1221022202087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221022202087 is an equidigital number, since it uses as much as digits as its factorization.

1221022202087 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 1221022202087 in words is "one trillion, two hundred twenty-one billion, twenty-two million, two hundred two thousand, eighty-seven".