135121210253 has 4 divisors (see below), whose sum is σ = 135130584060. Its totient is φ = 135111836448.

The previous prime is 135121210219. The next prime is 135121210277. The reversal of 135121210253 is 352012121531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65895916804 + 69225293449 = 256702^2 + 263107^2 .

It is a cyclic number.

It is not a de Polignac number, because 135121210253 - 2¹⁴ = 135121193869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135121210283) 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, 4665248 + ... + 4694121.

It is an arithmetic number, because the mean of its divisors is an integer number (33782646015).

Almost surely, 2^135121210253 is an apocalyptic number.

It is an amenable number.

135121210253 is a deficient number, since it is larger than the sum of its proper divisors (9373807).

135121210253 is an equidigital number, since it uses as much as digits as its factorization.

135121210253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9373806.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 135121210253 its reverse (352012121531), we get a palindrome (487133331784).

The spelling of 135121210253 in words is "one hundred thirty-five billion, one hundred twenty-one million, two hundred ten thousand, two hundred fifty-three".