268121218 has 4 divisors (see below), whose sum is σ = 402181830. Its totient is φ = 134060608.

The previous prime is 268121173. The next prime is 268121219. The reversal of 268121218 is 812121862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 267224409 + 896809 = 16347^2 + 947^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 268121218.

It is not an unprimeable number, because it can be changed into a prime (268121219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67030303 + ... + 67030306.

Almost surely, 2^268121218 is an apocalyptic number.

268121218 is a deficient number, since it is larger than the sum of its proper divisors (134060612).

268121218 is a wasteful number, since it uses less digits than its factorization.

268121218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134060611.

The product of its digits is 3072, while the sum is 31.

The square root of 268121218 is about 16374.4074091248. The cubic root of 268121218 is about 644.8277632373.

The spelling of 268121218 in words is "two hundred sixty-eight million, one hundred twenty-one thousand, two hundred eighteen".