221442436 has 12 divisors (see below), whose sum is σ = 404373312. Its totient is φ = 105907208.

The previous prime is 221442433. The next prime is 221442443. The reversal of 221442436 is 634244122.

It is a super-2 number, since 2×221442436² = 98073504923228192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221442433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1203400 + ... + 1203583.

It is an arithmetic number, because the mean of its divisors is an integer number (33697776).

Almost surely, 2^221442436 is an apocalyptic number.

It is an amenable number.

221442436 is a deficient number, since it is larger than the sum of its proper divisors (182930876).

221442436 is a wasteful number, since it uses less digits than its factorization.

221442436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407010 (or 2407008 counting only the distinct ones).

The product of its digits is 9216, while the sum is 28.

The square root of 221442436 is about 14880.9420400726. The cubic root of 221442436 is about 604.9975511592.

Adding to 221442436 its reverse (634244122), we get a palindrome (855686558).

It can be divided in two parts, 2214424 and 36, that added together give a triangular number (2214460 = T₂₁₀₄).

The spelling of 221442436 in words is "two hundred twenty-one million, four hundred forty-two thousand, four hundred thirty-six".