221062987 has 2 divisors, whose sum is σ = 221062988. Its totient is φ = 221062986.

The previous prime is 221062937. The next prime is 221062991. The reversal of 221062987 is 789260122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221062987 - 2²³ = 212674379 is a prime.

It is not a weakly prime, because it can be changed into another prime (221062927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110531493 + 110531494.

It is an arithmetic number, because the mean of its divisors is an integer number (110531494).

Almost surely, 2^221062987 is an apocalyptic number.

221062987 is a deficient number, since it is larger than the sum of its proper divisors (1).

221062987 is an equidigital number, since it uses as much as digits as its factorization.

221062987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 221062987 is about 14868.1870784571. The cubic root of 221062987 is about 604.6517924333.

The spelling of 221062987 in words is "two hundred twenty-one million, sixty-two thousand, nine hundred eighty-seven".