12021630 has 16 divisors (see below), whose sum is σ = 28851984. Its totient is φ = 3205760.

The previous prime is 12021629. The next prime is 12021641. The reversal of 12021630 is 3612021.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200331 + ... + 200390.

It is an arithmetic number, because the mean of its divisors is an integer number (1803249).

Almost surely, 2^12021630 is an apocalyptic number.

12021630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12021630 is an abundant number, since it is smaller than the sum of its proper divisors (16830354).

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

12021630 is a wasteful number, since it uses less digits than its factorization.

12021630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400731.

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

The square root of 12021630 is about 3467.2222311239. Note that the first 4 decimals coincide. The cubic root of 12021630 is about 229.0803224396.

Adding to 12021630 its reverse (3612021), we get a palindrome (15633651).

The spelling of 12021630 in words is "twelve million, twenty-one thousand, six hundred thirty".