2121530 has 16 divisors (see below), whose sum is σ = 3835944. Its totient is φ = 844800.

The previous prime is 2121529. The next prime is 2121569. The reversal of 2121530 is 351212.

It is a happy number.

2121530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1907161 + 214369 = 1381^2 + 463^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3230 + ... + 3830.

2^2121530 is an apocalyptic number.

2121530 is a deficient number, since it is larger than the sum of its proper divisors (1714414).

2121530 is a wasteful number, since it uses less digits than its factorization.

2121530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 2121530 is about 1456.5472872516. The cubic root of 2121530 is about 128.4940622146.

Adding to 2121530 its reverse (351212), we get a palindrome (2472742).

The spelling of 2121530 in words is "two million, one hundred twenty-one thousand, five hundred thirty".