12321420 has 24 divisors (see below), whose sum is σ = 34500144. Its totient is φ = 3285696.

The previous prime is 12321409. The next prime is 12321431. The reversal of 12321420 is 2412321.

It is an interprime number because it is at equal distance from previous prime (12321409) and next prime (12321431).

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

It is a self number, because there is not a number n which added to its sum of digits gives 12321420.

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, 102619 + ... + 102738.

It is an arithmetic number, because the mean of its divisors is an integer number (1437506).

Almost surely, 2^12321420 is an apocalyptic number.

12321420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12321420 is an abundant number, since it is smaller than the sum of its proper divisors (22178724).

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

12321420 is a wasteful number, since it uses less digits than its factorization.

12321420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205369 (or 205367 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 12321420 is about 3510.1880291517. The cubic root of 12321420 is about 230.9689431833.

Adding to 12321420 its reverse (2412321), we get a palindrome (14733741).

Subtracting from 12321420 its reverse (2412321), we obtain a palindrome (9909099).

It can be divided in two parts, 123 and 21420, that multiplied together give a triangular number (2634660 = T₂₂₉₅).

The spelling of 12321420 in words is "twelve million, three hundred twenty-one thousand, four hundred twenty".