221627868 has 48 divisors (see below), whose sum is σ = 644738304. Its totient is φ = 57565440.

The previous prime is 221627867. The next prime is 221627899. The reversal of 221627868 is 868726122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221627867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119005 + ... + 120852.

It is an arithmetic number, because the mean of its divisors is an integer number (13432048).

Almost surely, 2^221627868 is an apocalyptic number.

221627868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

221627868 is an abundant number, since it is smaller than the sum of its proper divisors (423110436).

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

221627868 is a wasteful number, since it uses less digits than its factorization.

221627868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239882 (or 239880 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 221627868 is about 14887.1712558162. The cubic root of 221627868 is about 605.1663754796.

The spelling of 221627868 in words is "two hundred twenty-one million, six hundred twenty-seven thousand, eight hundred sixty-eight".