221429492 has 6 divisors (see below), whose sum is σ = 387501618. Its totient is φ = 110714744.

The previous prime is 221429449. The next prime is 221429521. The reversal of 221429492 is 294924122.

It can be written as a sum of positive squares in only one way, i.e., 209554576 + 11874916 = 14476^2 + 3446^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 27678683 + ... + 27678690.

It is an arithmetic number, because the mean of its divisors is an integer number (64583603).

Almost surely, 2^221429492 is an apocalyptic number.

It is an amenable number.

221429492 is a deficient number, since it is larger than the sum of its proper divisors (166072126).

221429492 is a wasteful number, since it uses less digits than its factorization.

221429492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55357377 (or 55357375 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 221429492 is about 14880.5071150146. The cubic root of 221429492 is about 604.9857629325.

The spelling of 221429492 in words is "two hundred twenty-one million, four hundred twenty-nine thousand, four hundred ninety-two".