123540251222 has 4 divisors (see below), whose sum is σ = 185310376836. Its totient is φ = 61770125610.

The previous prime is 123540251221. The next prime is 123540251239. The reversal of 123540251222 is 222152045321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 222152045321 = 37 ⋅6004109333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123540251221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30885062804 + ... + 30885062807.

It is an arithmetic number, because the mean of its divisors is an integer number (46327594209).

Almost surely, 2^123540251222 is an apocalyptic number.

123540251222 is a deficient number, since it is larger than the sum of its proper divisors (61770125614).

123540251222 is an equidigital number, since it uses as much as digits as its factorization.

123540251222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61770125613.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 123540251222 its reverse (222152045321), we get a palindrome (345692296543).

The spelling of 123540251222 in words is "one hundred twenty-three billion, five hundred forty million, two hundred fifty-one thousand, two hundred twenty-two".