12321620 has 24 divisors (see below), whose sum is σ = 25941384. Its totient is φ = 4916096.

The previous prime is 12321611. The next prime is 12321637. The reversal of 12321620 is 2612321.

It can be written as a sum of positive squares in 4 ways, for example, as 29584 + 12292036 = 172^2 + 3506^2 .

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, 15062 + ... + 15858.

It is an arithmetic number, because the mean of its divisors is an integer number (1080891).

Almost surely, 2^12321620 is an apocalyptic number.

12321620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12321620 is an abundant number, since it is smaller than the sum of its proper divisors (13619764).

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

12321620 is a wasteful number, since it uses less digits than its factorization.

12321620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579 (or 1577 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 12321620 is about 3510.2165175385. The cubic root of 12321620 is about 230.9701928645.

Adding to 12321620 its reverse (2612321), we get a palindrome (14933941).

The spelling of 12321620 in words is "twelve million, three hundred twenty-one thousand, six hundred twenty".