123540202130 has 32 divisors (see below), whose sum is σ = 234380790000. Its totient is φ = 46811844352.

The previous prime is 123540202103. The next prime is 123540202139. The reversal of 123540202130 is 31202045321.

It can be written as a sum of positive squares in 8 ways, for example, as 52485435409 + 71054766721 = 229097^2 + 266561^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 123540202096 and 123540202105.

It is not an unprimeable number, because it can be changed into a prime (123540202139) 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 in 15 ways as a sum of consecutive naturals, for example, 4003505 + ... + 4034244.

Almost surely, 2^123540202130 is an apocalyptic number.

123540202130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123540202130 is a deficient number, since it is larger than the sum of its proper divisors (110840587870).

123540202130 is a wasteful number, since it uses less digits than its factorization.

123540202130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8037838.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 123540202130 its reverse (31202045321), we get a palindrome (154742247451).

The spelling of 123540202130 in words is "one hundred twenty-three billion, five hundred forty million, two hundred two thousand, one hundred thirty".