221215342 has 4 divisors (see below), whose sum is σ = 331823016. Its totient is φ = 110607670.

The previous prime is 221215333. The next prime is 221215343. The reversal of 221215342 is 243512122.

It is a happy number.

221215342 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221215343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55303834 + ... + 55303837.

It is an arithmetic number, because the mean of its divisors is an integer number (82955754).

Almost surely, 2^221215342 is an apocalyptic number.

221215342 is a deficient number, since it is larger than the sum of its proper divisors (110607674).

221215342 is a wasteful number, since it uses less digits than its factorization.

221215342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110607673.

The product of its digits is 960, while the sum is 22.

The square root of 221215342 is about 14873.3097190908. The cubic root of 221215342 is about 604.7906677375.

Adding to 221215342 its reverse (243512122), we get a palindrome (464727464).

The spelling of 221215342 in words is "two hundred twenty-one million, two hundred fifteen thousand, three hundred forty-two".