2121388 has 24 divisors (see below), whose sum is σ = 3960320. Its totient is φ = 991440.

The previous prime is 2121377. The next prime is 2121389. The reversal of 2121388 is 8831212.

It is not an unprimeable number, because it can be changed into a prime (2121389) 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, 7693 + ... + 7963.

2^2121388 is an apocalyptic number.

It is an amenable number.

2121388 is a deficient number, since it is larger than the sum of its proper divisors (1838932).

2121388 is a wasteful number, since it uses less digits than its factorization.

2121388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 395 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 2121388 is about 1456.4985410223. The cubic root of 2121388 is about 128.4911953270.

It can be divided in two parts, 212 and 1388, that added together give a square (1600 = 40²).

The spelling of 2121388 in words is "two million, one hundred twenty-one thousand, three hundred eighty-eight".