221725124 has 6 divisors (see below), whose sum is σ = 388018974. Its totient is φ = 110862560.

The previous prime is 221725111. The next prime is 221725139. The reversal of 221725124 is 421527122.

221725124 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 205062400 + 16662724 = 14320^2 + 4082^2 .

It is a super-2 number, since 2×221725124² = 98324061225630752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221725093 and 221725102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27715637 + ... + 27715644.

It is an arithmetic number, because the mean of its divisors is an integer number (64669829).

Almost surely, 2^221725124 is an apocalyptic number.

It is an amenable number.

221725124 is a deficient number, since it is larger than the sum of its proper divisors (166293850).

221725124 is a wasteful number, since it uses less digits than its factorization.

221725124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55431285 (or 55431283 counting only the distinct ones).

The product of its digits is 2240, while the sum is 26.

The square root of 221725124 is about 14890.4373340745. The cubic root of 221725124 is about 605.2548833832.

The spelling of 221725124 in words is "two hundred twenty-one million, seven hundred twenty-five thousand, one hundred twenty-four".