221222120999987 has 2 divisors, whose sum is σ = 221222120999988. Its totient is φ = 221222120999986.

The previous prime is 221222120999969. The next prime is 221222121000019. The reversal of 221222120999987 is 789999021222122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221222120999987 - 2⁸ = 221222120999731 is a prime.

It is not a weakly prime, because it can be changed into another prime (221222120999287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611060499993 + 110611060499994.

It is an arithmetic number, because the mean of its divisors is an integer number (110611060499994).

Almost surely, 2^{221222120999987} is an apocalyptic number.

221222120999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222120999987 is an equidigital number, since it uses as much as digits as its factorization.

221222120999987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23514624, while the sum is 65.

The spelling of 221222120999987 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, nine hundred ninety-nine thousand, nine hundred eighty-seven".