2151218 has 8 divisors (see below), whose sum is σ = 3396720. Its totient is φ = 1018980.

The previous prime is 2151211. The next prime is 2151221. The reversal of 2151218 is 8121512.

It is a happy number.

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2151218.

It is not an unprimeable number, because it can be changed into a prime (2151211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28268 + ... + 28343.

It is an arithmetic number, because the mean of its divisors is an integer number (424590).

2^2151218 is an apocalyptic number.

2151218 is a deficient number, since it is larger than the sum of its proper divisors (1245502).

2151218 is a wasteful number, since it uses less digits than its factorization.

2151218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56632.

The product of its digits is 160, while the sum is 20.

The square root of 2151218 is about 1466.7031056079. The cubic root of 2151218 is about 129.0906559841.

The spelling of 2151218 in words is "two million, one hundred fifty-one thousand, two hundred eighteen".