2121730 has 32 divisors (see below), whose sum is σ = 4334400. Its totient is φ = 741312.

The previous prime is 2121683. The next prime is 2121737. The reversal of 2121730 is 371212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2121737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2041 + ... + 2899.

It is an arithmetic number, because the mean of its divisors is an integer number (135450).

2^2121730 is an apocalyptic number.

2121730 is an abundant number, since it is smaller than the sum of its proper divisors (2212670).

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

2121730 is a wasteful number, since it uses less digits than its factorization.

2121730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 2121730 is about 1456.6159411458. The cubic root of 2121730 is about 128.4980998674.

Adding to 2121730 its reverse (371212), we get a palindrome (2492942).

The spelling of 2121730 in words is "two million, one hundred twenty-one thousand, seven hundred thirty".