121213404443 has 4 divisors (see below), whose sum is σ = 125393177040. Its totient is φ = 117033631848.

The previous prime is 121213404439. The next prime is 121213404461. The reversal of 121213404443 is 344404312121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121213404443 - 2² = 121213404439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 4179772567 = 121213404443 / (1 + 2 + 1 + 2 + 1 + 3 + 4 + 0 + 4 + 4 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121213404463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2089886255 + ... + 2089886312.

It is an arithmetic number, because the mean of its divisors is an integer number (31348294260).

Almost surely, 2^121213404443 is an apocalyptic number.

121213404443 is a deficient number, since it is larger than the sum of its proper divisors (4179772597).

121213404443 is an equidigital number, since it uses as much as digits as its factorization.

121213404443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4179772596.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 121213404443 its reverse (344404312121), we get a palindrome (465617716564).

The spelling of 121213404443 in words is "one hundred twenty-one billion, two hundred thirteen million, four hundred four thousand, four hundred forty-three".