221037385887 has 54 divisors (see below), whose sum is σ = 327864812184. Its totient is φ = 143492484960.

The previous prime is 221037385879. The next prime is 221037385897. The reversal of 221037385887 is 788583730122.

221037385887 is a `hidden beast` number, since 2 + 21 + 0 + 3 + 7 + 38 + 588 + 7 = 666.

It is not a de Polignac number, because 221037385887 - 2³ = 221037385879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221037385897) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1221200937 + ... + 1221201117.

It is an arithmetic number, because the mean of its divisors is an integer number (6071570596).

Almost surely, 2^221037385887 is an apocalyptic number.

221037385887 is a deficient number, since it is larger than the sum of its proper divisors (106827426297).

221037385887 is an equidigital number, since it uses as much as digits as its factorization.

221037385887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 418 counting only the distinct ones).

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

The spelling of 221037385887 in words is "two hundred twenty-one billion, thirty-seven million, three hundred eighty-five thousand, eight hundred eighty-seven".