221041400 has 24 divisors (see below), whose sum is σ = 513921720. Its totient is φ = 88416480.

The previous prime is 221041397. The next prime is 221041433. The reversal of 221041400 is 4140122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 552404 + ... + 552803.

It is an arithmetic number, because the mean of its divisors is an integer number (21413405).

Almost surely, 2^221041400 is an apocalyptic number.

221041400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221041400 is an abundant number, since it is smaller than the sum of its proper divisors (292880320).

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

221041400 is a wasteful number, since it uses less digits than its factorization.

221041400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105223 (or 1105214 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221041400 is about 14867.4611147970. The cubic root of 221041400 is about 604.6321101950.

Adding to 221041400 its reverse (4140122), we get a palindrome (225181522).

The spelling of 221041400 in words is "two hundred twenty-one million, forty-one thousand, four hundred".