135131911421 has 6 divisors (see below), whose sum is σ = 146326271130. Its totient is φ = 124737148848.

The previous prime is 135131911403. The next prime is 135131911423. The reversal of 135131911421 is 124119131531.

It can be written as a sum of positive squares in 3 ways, for example, as 5827396 + 135126084025 = 2414^2 + 367595^2 .

It is a de Polignac number, because none of the positive numbers 2^k-135131911421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135131911423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 399798386 + ... + 399798723.

It is an arithmetic number, because the mean of its divisors is an integer number (24387711855).

Almost surely, 2^135131911421 is an apocalyptic number.

It is an amenable number.

135131911421 is a deficient number, since it is larger than the sum of its proper divisors (11194359709).

135131911421 is an equidigital number, since it uses as much as digits as its factorization.

135131911421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799597135 (or 799597122 counting only the distinct ones).

The product of its digits is 3240, while the sum is 32.

The spelling of 135131911421 in words is "one hundred thirty-five billion, one hundred thirty-one million, nine hundred eleven thousand, four hundred twenty-one".