221630542 has 16 divisors (see below), whose sum is σ = 381617280. Its totient is φ = 94564728.

The previous prime is 221630537. The next prime is 221630561. The reversal of 221630542 is 245036122.

221630542 is digitally balanced in base 2, 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, 31692 + ... + 38047.

It is an arithmetic number, because the mean of its divisors is an integer number (23851080).

Almost surely, 2^221630542 is an apocalyptic number.

221630542 is a deficient number, since it is larger than the sum of its proper divisors (159986738).

221630542 is a wasteful number, since it uses less digits than its factorization.

221630542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69975.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 221630542 is about 14887.2610644134. The cubic root of 221630542 is about 605.1688093016.

Adding to 221630542 its reverse (245036122), we get a palindrome (466666664).

The spelling of 221630542 in words is "two hundred twenty-one million, six hundred thirty thousand, five hundred forty-two".