12321221264646 has 32 divisors (see below), whose sum is σ = 28165839940608. Its totient is φ = 3519967872960.

The previous prime is 12321221264581. The next prime is 12321221264683. The reversal of 12321221264646 is 64646212212321.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12321221264598 and 12321221264607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15484750 + ... + 16260993.

It is an arithmetic number, because the mean of its divisors is an integer number (880182498144).

Almost surely, 2^{12321221264646} is an apocalyptic number.

12321221264646 is an abundant number, since it is smaller than the sum of its proper divisors (15844618675962).

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

12321221264646 is a wasteful number, since it uses less digits than its factorization.

12321221264646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31754996.

The product of its digits is 331776, while the sum is 42.

Adding to 12321221264646 its reverse (64646212212321), we get a palindrome (76967433476967).

The spelling of 12321221264646 in words is "twelve trillion, three hundred twenty-one billion, two hundred twenty-one million, two hundred sixty-four thousand, six hundred forty-six".