221512874 has 8 divisors (see below), whose sum is σ = 362475648. Its totient is φ = 100687660.

The previous prime is 221512861. The next prime is 221512877. The reversal of 221512874 is 478215122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221512874.

It is not an unprimeable number, because it can be changed into a prime (221512877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5034362 + ... + 5034405.

It is an arithmetic number, because the mean of its divisors is an integer number (45309456).

Almost surely, 2^221512874 is an apocalyptic number.

221512874 is a deficient number, since it is larger than the sum of its proper divisors (140962774).

221512874 is a wasteful number, since it uses less digits than its factorization.

221512874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10068780.

The product of its digits is 8960, while the sum is 32.

The square root of 221512874 is about 14883.3085703415. The cubic root of 221512874 is about 605.0616916806.

Adding to 221512874 its reverse (478215122), we get a palindrome (699727996).

The spelling of 221512874 in words is "two hundred twenty-one million, five hundred twelve thousand, eight hundred seventy-four".