221425124 has 12 divisors (see below), whose sum is σ = 387738624. Its totient is φ = 110642664.

The previous prime is 221425093. The next prime is 221425199. The reversal of 221425124 is 421524122.

It is a self number, because there is not a number n which added to its sum of digits gives 221425124.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9992 + ... + 23295.

It is an arithmetic number, because the mean of its divisors is an integer number (32311552).

Almost surely, 2^221425124 is an apocalyptic number.

It is an amenable number.

221425124 is a deficient number, since it is larger than the sum of its proper divisors (166313500).

221425124 is a wasteful number, since it uses less digits than its factorization.

221425124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34954 (or 34952 counting only the distinct ones).

The product of its digits is 1280, while the sum is 23.

The square root of 221425124 is about 14880.3603450992. The cubic root of 221425124 is about 604.9817848488.

Adding to 221425124 its reverse (421524122), we get a palindrome (642949246).

The spelling of 221425124 in words is "two hundred twenty-one million, four hundred twenty-five thousand, one hundred twenty-four".