221211342 has 48 divisors (see below), whose sum is σ = 523888560. Its totient is φ = 66902400.

The previous prime is 221211269. The next prime is 221211379. The reversal of 221211342 is 243112122.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159492 + ... + 160872.

It is an arithmetic number, because the mean of its divisors is an integer number (10914345).

Almost surely, 2^221211342 is an apocalyptic number.

221211342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221211342 is an abundant number, since it is smaller than the sum of its proper divisors (302677218).

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

221211342 is a wasteful number, since it uses less digits than its factorization.

221211342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209 (or 2206 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 221211342 is about 14873.1752494214. The cubic root of 221211342 is about 604.7870224550.

Adding to 221211342 its reverse (243112122), we get a palindrome (464323464).

The spelling of 221211342 in words is "two hundred twenty-one million, two hundred eleven thousand, three hundred forty-two".