123550121243 has 4 divisors (see below), whose sum is σ = 123551472408. Its totient is φ = 123548770080.

The previous prime is 123550121197. The next prime is 123550121251. The reversal of 123550121243 is 342121055321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342121055321 = 479 ⋅714240199.

It is a cyclic number.

It is not a de Polignac number, because 123550121243 - 2¹² = 123550117147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123550121543) 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, 527621 + ... + 724902.

It is an arithmetic number, because the mean of its divisors is an integer number (30887868102).

Almost surely, 2^123550121243 is an apocalyptic number.

123550121243 is a deficient number, since it is larger than the sum of its proper divisors (1351165).

123550121243 is an equidigital number, since it uses as much as digits as its factorization.

123550121243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351164.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 123550121243 its reverse (342121055321), we get a palindrome (465671176564).

The spelling of 123550121243 in words is "one hundred twenty-three billion, five hundred fifty million, one hundred twenty-one thousand, two hundred forty-three".