2121988 has 24 divisors (see below), whose sum is σ = 4193280. Its totient is φ = 930720.

The previous prime is 2121979. The next prime is 2121989. The reversal of 2121988 is 8891212.

It is a happy number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2121989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 445 + ... + 2107.

It is an arithmetic number, because the mean of its divisors is an integer number (174720).

2^2121988 is an apocalyptic number.

It is an amenable number.

2121988 is a deficient number, since it is larger than the sum of its proper divisors (2071292).

2121988 is a wasteful number, since it uses less digits than its factorization.

2121988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707 (or 1705 counting only the distinct ones).

The product of its digits is 2304, while the sum is 31.

The square root of 2121988 is about 1456.7044998901. The cubic root of 2121988 is about 128.5033080648.

The spelling of 2121988 in words is "two million, one hundred twenty-one thousand, nine hundred eighty-eight".