221111120987 has 2 divisors, whose sum is σ = 221111120988. Its totient is φ = 221111120986.

The previous prime is 221111120983. The next prime is 221111121013. The reversal of 221111120987 is 789021111122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221111120987 - 2² = 221111120983 is a prime.

It is not a weakly prime, because it can be changed into another prime (221111120981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555560493 + 110555560494.

It is an arithmetic number, because the mean of its divisors is an integer number (110555560494).

Almost surely, 2^221111120987 is an apocalyptic number.

221111120987 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111120987 is an equidigital number, since it uses as much as digits as its factorization.

221111120987 is an evil number, because the sum of its binary digits is even.

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

The spelling of 221111120987 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred twenty thousand, nine hundred eighty-seven".