135121210252 has 48 divisors (see below), whose sum is σ = 272404564992. Its totient is φ = 57446827200.

The previous prime is 135121210219. The next prime is 135121210277. The reversal of 135121210252 is 252012121531.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3119898 + ... + 3162910.

It is an arithmetic number, because the mean of its divisors is an integer number (5675095104).

Almost surely, 2^135121210252 is an apocalyptic number.

It is an amenable number.

135121210252 is an abundant number, since it is smaller than the sum of its proper divisors (137283354740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135121210252 is a wasteful number, since it uses less digits than its factorization.

135121210252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43918 (or 43916 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 135121210252 its reverse (252012121531), we get a palindrome (387133331783).

The spelling of 135121210252 in words is "one hundred thirty-five billion, one hundred twenty-one million, two hundred ten thousand, two hundred fifty-two".