1221010211987 has 2 divisors, whose sum is σ = 1221010211988. Its totient is φ = 1221010211986.

The previous prime is 1221010211929. The next prime is 1221010212017. The reversal of 1221010211987 is 7891120101221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221010211987 - 2⁸ = 1221010211731 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221010211587) 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, 610505105993 + 610505105994.

It is an arithmetic number, because the mean of its divisors is an integer number (610505105994).

Almost surely, 2^{1221010211987} is an apocalyptic number.

1221010211987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221010211987 is an equidigital number, since it uses as much as digits as its factorization.

1221010211987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 35.

The spelling of 1221010211987 in words is "one trillion, two hundred twenty-one billion, ten million, two hundred eleven thousand, nine hundred eighty-seven".