221142404 has 24 divisors (see below), whose sum is σ = 448347648. Its totient is φ = 93476160.

The previous prime is 221142403. The next prime is 221142413. The reversal of 221142404 is 404241122.

221142404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221142403) 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, 52052 + ... + 56139.

It is an arithmetic number, because the mean of its divisors is an integer number (18681152).

Almost surely, 2^221142404 is an apocalyptic number.

It is an amenable number.

221142404 is an abundant number, since it is smaller than the sum of its proper divisors (227205244).

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

221142404 is a wasteful number, since it uses less digits than its factorization.

221142404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108275 (or 108273 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 221142404 is about 14870.8575408414. The cubic root of 221142404 is about 604.7241909275.

Adding to 221142404 its reverse (404241122), we get a palindrome (625383526).

The spelling of 221142404 in words is "two hundred twenty-one million, one hundred forty-two thousand, four hundred four".