221207124 has 24 divisors (see below), whose sum is σ = 520093728. Its totient is φ = 73172320.

The previous prime is 221207083. The next prime is 221207131. The reversal of 221207124 is 421702122.

It is a self number, because there is not a number n which added to its sum of digits gives 221207124.

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, 68787 + ... + 71930.

It is an arithmetic number, because the mean of its divisors is an integer number (21670572).

Almost surely, 2^221207124 is an apocalyptic number.

It is an amenable number.

221207124 is an abundant number, since it is smaller than the sum of its proper divisors (298886604).

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

221207124 is a wasteful number, since it uses less digits than its factorization.

221207124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140855 (or 140853 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 221207124 is about 14873.0334498380. The cubic root of 221207124 is about 604.7831784570.

Adding to 221207124 its reverse (421702122), we get a palindrome (642909246).

The spelling of 221207124 in words is "two hundred twenty-one million, two hundred seven thousand, one hundred twenty-four".