2188121 has 8 divisors (see below), whose sum is σ = 2495304. Its totient is φ = 1900800.

The previous prime is 2188117. The next prime is 2188127. The reversal of 2188121 is 1218812.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 774400 + 1413721 = 880^2 + 1189^2 .

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 2188121 - 2² = 2188117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2188127) 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, 4730 + ... + 5171.

It is an arithmetic number, because the mean of its divisors is an integer number (311913).

2^2188121 is an apocalyptic number.

It is an amenable number.

2188121 is a deficient number, since it is larger than the sum of its proper divisors (307183).

2188121 is a wasteful number, since it uses less digits than its factorization.

2188121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9931.

The product of its digits is 256, while the sum is 23.

The square root of 2188121 is about 1479.2298671944. The cubic root of 2188121 is about 129.8246353415.

The spelling of 2188121 in words is "two million, one hundred eighty-eight thousand, one hundred twenty-one".