1218888121 has 8 divisors (see below), whose sum is σ = 1330091424. Its totient is φ = 1107750720.

The previous prime is 1218888119. The next prime is 1218888127.

1218888121 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 1218888121 - 2¹ = 1218888119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218888127) 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, 27265 + ... + 56401.

It is an arithmetic number, because the mean of its divisors is an integer number (166261428).

Almost surely, 2^1218888121 is an apocalyptic number.

1218888121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1218888121 is a deficient number, since it is larger than the sum of its proper divisors (111203303).

1218888121 is a wasteful number, since it uses less digits than its factorization.

1218888121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32951.

The product of its digits is 16384, while the sum is 40.

The square root of 1218888121 is about 34912.5782634282. The cubic root of 1218888121 is about 1068.2050206192.

The spelling of 1218888121 in words is "one billion, two hundred eighteen million, eight hundred eighty-eight thousand, one hundred twenty-one".