12210400323440 has 40 divisors (see below), whose sum is σ = 30970015368048. Its totient is φ = 4440145571840.

The previous prime is 12210400323421. The next prime is 12210400323467. The reversal of 12210400323440 is 4432300401221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×12210400323440² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6937726577 + ... + 6937728336.

Almost surely, 2^{12210400323440} is an apocalyptic number.

12210400323440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12210400323440 is an abundant number, since it is smaller than the sum of its proper divisors (18759615044608).

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

12210400323440 is a wasteful number, since it uses less digits than its factorization.

12210400323440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13875454937 (or 13875454931 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 12210400323440 its reverse (4432300401221), we get a palindrome (16642700724661).

The spelling of 12210400323440 in words is "twelve trillion, two hundred ten billion, four hundred million, three hundred twenty-three thousand, four hundred forty".