221001211199987 has 2 divisors, whose sum is σ = 221001211199988. Its totient is φ = 221001211199986.

The previous prime is 221001211199957. The next prime is 221001211200043. The reversal of 221001211199987 is 789991112100122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221001211199987 - 2³⁸ = 220726333293043 is a prime.

It is a super-2 number, since 2×221001211199987² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221001211199947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500605599993 + 110500605599994.

It is an arithmetic number, because the mean of its divisors is an integer number (110500605599994).

Almost surely, 2^{221001211199987} is an apocalyptic number.

221001211199987 is a deficient number, since it is larger than the sum of its proper divisors (1).

221001211199987 is an equidigital number, since it uses as much as digits as its factorization.

221001211199987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 53.

The spelling of 221001211199987 in words is "two hundred twenty-one trillion, one billion, two hundred eleven million, one hundred ninety-nine thousand, nine hundred eighty-seven".