221816742 has 32 divisors (see below), whose sum is σ = 507451392. Its totient is φ = 63321024.

The previous prime is 221816741. The next prime is 221816779. The reversal of 221816742 is 247618122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221816741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91498 + ... + 93890.

It is an arithmetic number, because the mean of its divisors is an integer number (15857856).

Almost surely, 2^221816742 is an apocalyptic number.

221816742 is an abundant number, since it is smaller than the sum of its proper divisors (285634650).

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

221816742 is a wasteful number, since it uses less digits than its factorization.

221816742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4612.

The product of its digits is 10752, while the sum is 33.

The square root of 221816742 is about 14893.5134202780. The cubic root of 221816742 is about 605.3382367487.

The spelling of 221816742 in words is "two hundred twenty-one million, eight hundred sixteen thousand, seven hundred forty-two".