2121040 has 20 divisors (see below), whose sum is σ = 4931604. Its totient is φ = 848384.

The previous prime is 2121029. The next prime is 2121043. The reversal of 2121040 is 401212.

It can be written as a sum of positive squares in 2 ways, for example, as 553536 + 1567504 = 744^2 + 1252^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121043) 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, 13177 + ... + 13336.

2^2121040 is an apocalyptic number.

2121040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121040 is an abundant number, since it is smaller than the sum of its proper divisors (2810564).

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

2121040 is a wasteful number, since it uses less digits than its factorization.

2121040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26526 (or 26520 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2121040 is about 1456.3790715332. The cubic root of 2121040 is about 128.4841688926.

Adding to 2121040 its reverse (401212), we get a palindrome (2522252).

The spelling of 2121040 in words is "two million, one hundred twenty-one thousand, forty".