221221100987 has 2 divisors, whose sum is σ = 221221100988. Its totient is φ = 221221100986.

The previous prime is 221221100923. The next prime is 221221101029. The reversal of 221221100987 is 789001122122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221221100987 - 2⁶ = 221221100923 is a prime.

It is not a weakly prime, because it can be changed into another prime (221221100687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610550493 + 110610550494.

It is an arithmetic number, because the mean of its divisors is an integer number (110610550494).

Almost surely, 2^221221100987 is an apocalyptic number.

221221100987 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221100987 is an equidigital number, since it uses as much as digits as its factorization.

221221100987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 221221100987 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, nine hundred eighty-seven".