2121630 has 32 divisors (see below), whose sum is σ = 5819904. Its totient is φ = 484896.

The previous prime is 2121619. The next prime is 2121631. The reversal of 2121630 is 361212.

2121630 = 229² + 230² + ... + 263².

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121631) 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, 4842 + ... + 5261.

It is an arithmetic number, because the mean of its divisors is an integer number (181872).

2^2121630 is an apocalyptic number.

2121630 is an abundant number, since it is smaller than the sum of its proper divisors (3698274).

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

2121630 is a wasteful number, since it uses less digits than its factorization.

2121630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10120.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2121630 is about 1456.5816146032. The cubic root of 2121630 is about 128.4960810727.

Adding to 2121630 its reverse (361212), we get a palindrome (2482842).

The spelling of 2121630 in words is "two million, one hundred twenty-one thousand, six hundred thirty".