221350837887 has 16 divisors (see below), whose sum is σ = 329287870560. Its totient is φ = 146954908800.

The previous prime is 221350837871. The next prime is 221350837909. The reversal of 221350837887 is 788738053122.

221350837887 is a `hidden beast` number, since 2 + 21 + 3 + 508 + 37 + 8 + 87 = 666.

It is not a de Polignac number, because 221350837887 - 2⁴ = 221350837871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221350837837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17002164 + ... + 17015177.

It is an arithmetic number, because the mean of its divisors is an integer number (20580491910).

Almost surely, 2^221350837887 is an apocalyptic number.

221350837887 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

221350837887 is a deficient number, since it is larger than the sum of its proper divisors (107937032673).

221350837887 is a wasteful number, since it uses less digits than its factorization.

221350837887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34017591 (or 34017585 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 221350837887 in words is "two hundred twenty-one billion, three hundred fifty million, eight hundred thirty-seven thousand, eight hundred eighty-seven".