221121368 has 16 divisors (see below), whose sum is σ = 446495280. Its totient is φ = 102055968.

The previous prime is 221121367. The next prime is 221121389. The reversal of 221121368 is 863121122.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1062980 + ... + 1063187.

It is an arithmetic number, because the mean of its divisors is an integer number (27905955).

Almost surely, 2^221121368 is an apocalyptic number.

It is an amenable number.

221121368 is an abundant number, since it is smaller than the sum of its proper divisors (225373912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221121368 is a wasteful number, since it uses less digits than its factorization.

221121368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126186 (or 2126182 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 221121368 is about 14870.1502346143. The cubic root of 221121368 is about 604.7050156793.

The spelling of 221121368 in words is "two hundred twenty-one million, one hundred twenty-one thousand, three hundred sixty-eight".