12121630 has 16 divisors (see below), whose sum is σ = 22231584. Its totient is φ = 4756960.

The previous prime is 12121619. The next prime is 12121631. The reversal of 12121630 is 3612121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10906 + ... + 11965.

It is an arithmetic number, because the mean of its divisors is an integer number (1389474).

Almost surely, 2^12121630 is an apocalyptic number.

12121630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12121630 is a deficient number, since it is larger than the sum of its proper divisors (10109954).

12121630 is a wasteful number, since it uses less digits than its factorization.

12121630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22931.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 12121630 is about 3481.6131318686. The cubic root of 12121630 is about 229.7137585942.

Adding to 12121630 its reverse (3612121), we get a palindrome (15733751).

The spelling of 12121630 in words is "twelve million, one hundred twenty-one thousand, six hundred thirty".