135137421 has 12 divisors (see below), whose sum is σ = 195446940. Its totient is φ = 89976960.

The previous prime is 135137407. The next prime is 135137441. The reversal of 135137421 is 124731531.

It can be written as a sum of positive squares in 2 ways, for example, as 95824521 + 39312900 = 9789^2 + 6270^2 .

It is not a de Polignac number, because 135137421 - 2¹⁵ = 135104653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135137441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1756 + ... + 16533.

It is an arithmetic number, because the mean of its divisors is an integer number (16287245).

Almost surely, 2^135137421 is an apocalyptic number.

It is an amenable number.

135137421 is a deficient number, since it is larger than the sum of its proper divisors (60309519).

135137421 is a wasteful number, since it uses less digits than its factorization.

135137421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19116 (or 19113 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 135137421 is about 11624.8621927316. The cubic root of 135137421 is about 513.1667891260.

Adding to 135137421 its reverse (124731531), we get a palindrome (259868952).

The spelling of 135137421 in words is "one hundred thirty-five million, one hundred thirty-seven thousand, four hundred twenty-one".