221623887 has 16 divisors (see below), whose sum is σ = 306708480. Its totient is φ = 142178400.

The previous prime is 221623813. The next prime is 221623903. The reversal of 221623887 is 788326122.

It is not a de Polignac number, because 221623887 - 2¹¹ = 221621839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221621887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22962 + ... + 31152.

It is an arithmetic number, because the mean of its divisors is an integer number (19169280).

Almost surely, 2^221623887 is an apocalyptic number.

221623887 is a deficient number, since it is larger than the sum of its proper divisors (85084593).

221623887 is a wasteful number, since it uses less digits than its factorization.

221623887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8534.

The product of its digits is 64512, while the sum is 39.

The square root of 221623887 is about 14887.0375494925. The cubic root of 221623887 is about 605.1627520156.

The spelling of 221623887 in words is "two hundred twenty-one million, six hundred twenty-three thousand, eight hundred eighty-seven".