121556223043 has 4 divisors (see below), whose sum is σ = 121740121168. Its totient is φ = 121372324920.

The previous prime is 121556223011. The next prime is 121556223059. The reversal of 121556223043 is 340322655121.

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 121556223043 - 2⁵ = 121556223011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121556223743) 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, 91948071 + ... + 91949392.

It is an arithmetic number, because the mean of its divisors is an integer number (30435030292).

Almost surely, 2^121556223043 is an apocalyptic number.

121556223043 is a deficient number, since it is larger than the sum of its proper divisors (183898125).

121556223043 is an equidigital number, since it uses as much as digits as its factorization.

121556223043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183898124.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 121556223043 its reverse (340322655121), we get a palindrome (461878878164).

The spelling of 121556223043 in words is "one hundred twenty-one billion, five hundred fifty-six million, two hundred twenty-three thousand, forty-three".