221304342 has 16 divisors (see below), whose sum is σ = 505838592. Its totient is φ = 63229800.

The previous prime is 221304337. The next prime is 221304371. The reversal of 221304342 is 243403122.

It is a super-2 number, since 2×221304342² = 97951223576105928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2634534 + ... + 2634617.

It is an arithmetic number, because the mean of its divisors is an integer number (31614912).

Almost surely, 2^221304342 is an apocalyptic number.

221304342 is an abundant number, since it is smaller than the sum of its proper divisors (284534250).

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

221304342 is a wasteful number, since it uses less digits than its factorization.

221304342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5269163.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 221304342 is about 14876.3013548395. The cubic root of 221304342 is about 604.8717639099.

Adding to 221304342 its reverse (243403122), we get a palindrome (464707464).

The spelling of 221304342 in words is "two hundred twenty-one million, three hundred four thousand, three hundred forty-two".