12121320344 has 32 divisors (see below), whose sum is σ = 27103576320. Its totient is φ = 4968987936.

The previous prime is 12121320329. The next prime is 12121320359. The reversal of 12121320344 is 44302312121.

It is an interprime number because it is at equal distance from previous prime (12121320329) and next prime (12121320359).

It is a Harshad number since it is a multiple of its sum of digits (23).

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, 4704194 + ... + 4706769.

It is an arithmetic number, because the mean of its divisors is an integer number (846986760).

Almost surely, 2^12121320344 is an apocalyptic number.

12121320344 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

12121320344 is an abundant number, since it is smaller than the sum of its proper divisors (14982255976).

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

12121320344 is a wasteful number, since it uses less digits than its factorization.

12121320344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9410999 (or 9410995 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 12121320344 its reverse (44302312121), we get a palindrome (56423632465).

The spelling of 12121320344 in words is "twelve billion, one hundred twenty-one million, three hundred twenty thousand, three hundred forty-four".