221606742 has 16 divisors (see below), whose sum is σ = 506529792. Its totient is φ = 63316200.

The previous prime is 221606729. The next prime is 221606743. The reversal of 221606742 is 247606122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221606743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2638134 + ... + 2638217.

It is an arithmetic number, because the mean of its divisors is an integer number (31658112).

Almost surely, 2^221606742 is an apocalyptic number.

221606742 is an abundant number, since it is smaller than the sum of its proper divisors (284923050).

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

221606742 is a wasteful number, since it uses less digits than its factorization.

221606742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5276363.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 221606742 is about 14886.4617018283. The cubic root of 221606742 is about 605.1471463228.

The spelling of 221606742 in words is "two hundred twenty-one million, six hundred six thousand, seven hundred forty-two".