221621342 has 16 divisors (see below), whose sum is σ = 341914272. Its totient is φ = 107658720.

The previous prime is 221621293. The next prime is 221621437. The reversal of 221621342 is 243126122.

It is a happy number.

221621342 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent 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, 61367 + ... + 64877.

It is an arithmetic number, because the mean of its divisors is an integer number (21369642).

Almost surely, 2^221621342 is an apocalyptic number.

221621342 is a deficient number, since it is larger than the sum of its proper divisors (120292930).

221621342 is a wasteful number, since it uses less digits than its factorization.

221621342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4403.

The product of its digits is 1152, while the sum is 23.

The square root of 221621342 is about 14886.9520722007. The cubic root of 221621342 is about 605.1604355609.

Adding to 221621342 its reverse (243126122), we get a palindrome (464747464).

The spelling of 221621342 in words is "two hundred twenty-one million, six hundred twenty-one thousand, three hundred forty-two".