221402860 has 24 divisors (see below), whose sum is σ = 531367200. Its totient is φ = 75909504.

The previous prime is 221402827. The next prime is 221402873. The reversal of 221402860 is 68204122.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 790585 + ... + 790864.

It is an arithmetic number, because the mean of its divisors is an integer number (22140300).

Almost surely, 2^221402860 is an apocalyptic number.

221402860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221402860 is an abundant number, since it is smaller than the sum of its proper divisors (309964340).

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

221402860 is a wasteful number, since it uses less digits than its factorization.

221402860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581465 (or 1581463 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 221402860 is about 14879.6122261301. The cubic root of 221402860 is about 604.9615074661.

Adding to 221402860 its reverse (68204122), we get a palindrome (289606982).

The spelling of 221402860 in words is "two hundred twenty-one million, four hundred two thousand, eight hundred sixty".