121011220543 has 4 divisors (see below), whose sum is σ = 121016015208. Its totient is φ = 121006425880.

The previous prime is 121011220511. The next prime is 121011220567. The reversal of 121011220543 is 345022110121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345022110121 = 13 ⋅26540162317.

It is a cyclic number.

It is not a de Polignac number, because 121011220543 - 2⁵ = 121011220511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011220243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2359273 + ... + 2410018.

It is an arithmetic number, because the mean of its divisors is an integer number (30254003802).

Almost surely, 2^121011220543 is an apocalyptic number.

121011220543 is a deficient number, since it is larger than the sum of its proper divisors (4794665).

121011220543 is an equidigital number, since it uses as much as digits as its factorization.

121011220543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4794664.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 121011220543 its reverse (345022110121), we get a palindrome (466033330664).

The spelling of 121011220543 in words is "one hundred twenty-one billion, eleven million, two hundred twenty thousand, five hundred forty-three".