121312443 has 8 divisors (see below), whose sum is σ = 184857088. Its totient is φ = 69321384.

The previous prime is 121312409. The next prime is 121312447. The reversal of 121312443 is 344213121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121312443 - 2⁶ = 121312379 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 5776783 = 121312443 / (1 + 2 + 1 + 3 + 1 + 2 + 4 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121312447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2888371 + ... + 2888412.

It is an arithmetic number, because the mean of its divisors is an integer number (23107136).

Almost surely, 2^121312443 is an apocalyptic number.

121312443 is a deficient number, since it is larger than the sum of its proper divisors (63544645).

121312443 is an equidigital number, since it uses as much as digits as its factorization.

121312443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5776793.

The product of its digits is 576, while the sum is 21.

The square root of 121312443 is about 11014.1927983852. The cubic root of 121312443 is about 495.0341002934.

Adding to 121312443 its reverse (344213121), we get a palindrome (465525564).

The spelling of 121312443 in words is "one hundred twenty-one million, three hundred twelve thousand, four hundred forty-three".