221310342 has 24 divisors (see below), whose sum is σ = 523097640. Its totient is φ = 67063680.

The previous prime is 221310317. The next prime is 221310343. The reversal of 221310342 is 243013122.

221310342 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221310343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 558667 + ... + 559062.

It is an arithmetic number, because the mean of its divisors is an integer number (21795735).

Almost surely, 2^221310342 is an apocalyptic number.

221310342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221310342 is an abundant number, since it is smaller than the sum of its proper divisors (301787298).

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

221310342 is a wasteful number, since it uses less digits than its factorization.

221310342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117748 (or 1117745 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 221310342 is about 14876.5030165022. The cubic root of 221310342 is about 604.8772302852.

Adding to 221310342 its reverse (243013122), we get a palindrome (464323464).

The spelling of 221310342 in words is "two hundred twenty-one million, three hundred ten thousand, three hundred forty-two".