221134542 has 16 divisors (see below), whose sum is σ = 443459280. Its totient is φ = 73513152.

The previous prime is 221134519. The next prime is 221134549. The reversal of 221134542 is 245431122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221134549) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 47167 + ... + 51642.

It is an arithmetic number, because the mean of its divisors is an integer number (27716205).

Almost surely, 2^221134542 is an apocalyptic number.

221134542 is an abundant number, since it is smaller than the sum of its proper divisors (222324738).

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

221134542 is a wasteful number, since it uses less digits than its factorization.

221134542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99187.

The product of its digits is 1920, while the sum is 24.

The square root of 221134542 is about 14870.5931959690. The cubic root of 221134542 is about 604.7170245077.

Adding to 221134542 its reverse (245431122), we get a palindrome (466565664).

The spelling of 221134542 in words is "two hundred twenty-one million, one hundred thirty-four thousand, five hundred forty-two".