221425044 has 24 divisors (see below), whose sum is σ = 517157760. Its totient is φ = 73737024.

The previous prime is 221425021. The next prime is 221425079. The reversal of 221425044 is 440524122.

It is a happy number.

221425044 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221425044² = 98058100220803872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4872 + ... + 21600.

It is an arithmetic number, because the mean of its divisors is an integer number (21548240).

Almost surely, 2^221425044 is an apocalyptic number.

It is an amenable number.

221425044 is an abundant number, since it is smaller than the sum of its proper divisors (295732716).

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

221425044 is a wasteful number, since it uses less digits than its factorization.

221425044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17839 (or 17837 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 221425044 is about 14880.3576569920. The cubic root of 221425044 is about 604.9817119896.

Adding to 221425044 its reverse (440524122), we get a palindrome (661949166).

The spelling of 221425044 in words is "two hundred twenty-one million, four hundred twenty-five thousand, forty-four".