221122044 has 72 divisors (see below), whose sum is σ = 656680752. Its totient is φ = 61850880.

The previous prime is 221122003. The next prime is 221122049. The reversal of 221122044 is 440221122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221122049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16329 + ... + 26624.

It is an arithmetic number, because the mean of its divisors is an integer number (9120566).

Almost surely, 2^221122044 is an apocalyptic number.

It is an amenable number.

221122044 is an abundant number, since it is smaller than the sum of its proper divisors (435558708).

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

221122044 is a wasteful number, since it uses less digits than its factorization.

221122044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42987 (or 42982 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 221122044 is about 14870.1729646968. The cubic root of 221122044 is about 604.7056319023.

Adding to 221122044 its reverse (440221122), we get a palindrome (661343166).

It can be divided in two parts, 221 and 122044, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 221122044 in words is "two hundred twenty-one million, one hundred twenty-two thousand, forty-four".