221846987 has 2 divisors, whose sum is σ = 221846988. Its totient is φ = 221846986.

The previous prime is 221846981. The next prime is 221846993. The reversal of 221846987 is 789648122.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (221846981) and next prime (221846993).

It is a cyclic number.

It is not a de Polignac number, because 221846987 - 2¹⁰ = 221845963 is a prime.

It is not a weakly prime, because it can be changed into another prime (221846981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110923493 + 110923494.

It is an arithmetic number, because the mean of its divisors is an integer number (110923494).

Almost surely, 2^221846987 is an apocalyptic number.

221846987 is a deficient number, since it is larger than the sum of its proper divisors (1).

221846987 is an equidigital number, since it uses as much as digits as its factorization.

221846987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 47.

The square root of 221846987 is about 14894.5287605886. The cubic root of 221846987 is about 605.3657483825.

The spelling of 221846987 in words is "two hundred twenty-one million, eight hundred forty-six thousand, nine hundred eighty-seven".