2121408 has 84 divisors (see below), whose sum is σ = 6339840. Its totient is φ = 677376.

The previous prime is 2121403. The next prime is 2121433. The reversal of 2121408 is 8041212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2121403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16641 + ... + 16767.

2^2121408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3169920).

2121408 is an abundant number, since it is smaller than the sum of its proper divisors (4218432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121408 is a wasteful number, since it uses less digits than its factorization.

2121408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 2121408 is about 1456.5054067871. The cubic root of 2121408 is about 128.4915991217.

The spelling of 2121408 in words is "two million, one hundred twenty-one thousand, four hundred eight".