221317124 has 18 divisors (see below), whose sum is σ = 450538830. Its totient is φ = 94850112.

The previous prime is 221317123. The next prime is 221317127. The reversal of 221317124 is 421713122.

It can be written as a sum of positive squares in only one way, i.e., 145974724 + 75342400 = 12082^2 + 8680^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221317124.

It is not an unprimeable number, because it can be changed into a prime (221317121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 564389 + ... + 564780.

It is an arithmetic number, because the mean of its divisors is an integer number (25029935).

Almost surely, 2^221317124 is an apocalyptic number.

It is an amenable number.

221317124 is an abundant number, since it is smaller than the sum of its proper divisors (229221706).

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

221317124 is a wasteful number, since it uses less digits than its factorization.

221317124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129187 (or 1129178 counting only the distinct ones).

The product of its digits is 672, while the sum is 23.

The square root of 221317124 is about 14876.7309581104. The cubic root of 221317124 is about 604.8834089925.

The spelling of 221317124 in words is "two hundred twenty-one million, three hundred seventeen thousand, one hundred twenty-four".