121120021243 has 4 divisors (see below), whose sum is σ = 130436945968. Its totient is φ = 111803096520.

The previous prime is 121120021241. The next prime is 121120021249. The reversal of 121120021243 is 342120021121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342120021121 = 23 ⋅14874783527.

It is a cyclic number.

It is not a de Polignac number, because 121120021243 - 2¹ = 121120021241 is a prime.

It is a super-3 number, since 3×121120021243³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121120021243.

It is not an unprimeable number, because it can be changed into a prime (121120021241) 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, 4658462343 + ... + 4658462368.

It is an arithmetic number, because the mean of its divisors is an integer number (32609236492).

Almost surely, 2^121120021243 is an apocalyptic number.

121120021243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121120021243 is a deficient number, since it is larger than the sum of its proper divisors (9316924725).

121120021243 is an equidigital number, since it uses as much as digits as its factorization.

121120021243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9316924724.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 121120021243 its reverse (342120021121), we get a palindrome (463240042364).

The spelling of 121120021243 in words is "one hundred twenty-one billion, one hundred twenty million, twenty-one thousand, two hundred forty-three".