221838124 has 24 divisors (see below), whose sum is σ = 392158368. Its totient is φ = 109799040.

The previous prime is 221838121. The next prime is 221838131. The reversal of 221838124 is 421838122.

It is a happy number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (221838121) 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, 208554 + ... + 209614.

It is an arithmetic number, because the mean of its divisors is an integer number (16339932).

Almost surely, 2^221838124 is an apocalyptic number.

It is an amenable number.

221838124 is a deficient number, since it is larger than the sum of its proper divisors (170320244).

221838124 is a wasteful number, since it uses less digits than its factorization.

221838124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545 (or 1543 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

The square root of 221838124 is about 14894.2312322590. The cubic root of 221838124 is about 605.3576866276.

The spelling of 221838124 in words is "two hundred twenty-one million, eight hundred thirty-eight thousand, one hundred twenty-four".