221100340 has 24 divisors (see below), whose sum is σ = 488748960. Its totient is φ = 83785248.

The previous prime is 221100323. The next prime is 221100349. The reversal of 221100340 is 43001122.

It is a self number, because there is not a number n which added to its sum of digits gives 221100340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100349) 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, 290542 + ... + 291301.

It is an arithmetic number, because the mean of its divisors is an integer number (20364540).

Almost surely, 2^221100340 is an apocalyptic number.

221100340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221100340 is an abundant number, since it is smaller than the sum of its proper divisors (267648620).

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

221100340 is a wasteful number, since it uses less digits than its factorization.

221100340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581871 (or 581869 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221100340 is about 14869.4431637503. The cubic root of 221100340 is about 604.6858465080.

Adding to 221100340 its reverse (43001122), we get a palindrome (264101462).

The spelling of 221100340 in words is "two hundred twenty-one million, one hundred thousand, three hundred forty".