136351421 has 4 divisors (see below), whose sum is σ = 136403100. Its totient is φ = 136299744.

The previous prime is 136351379. The next prime is 136351427. The reversal of 136351421 is 124153631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124153631 = 7 ⋅17736233.

It can be written as a sum of positive squares in 2 ways, for example, as 83265625 + 53085796 = 9125^2 + 7286^2 .

It is a cyclic number.

It is not a de Polignac number, because 136351421 - 2⁶ = 136351357 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 (136351427) 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, 21656 + ... + 27233.

It is an arithmetic number, because the mean of its divisors is an integer number (34100775).

Almost surely, 2^136351421 is an apocalyptic number.

It is an amenable number.

136351421 is a deficient number, since it is larger than the sum of its proper divisors (51679).

136351421 is an equidigital number, since it uses as much as digits as its factorization.

136351421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51678.

The product of its digits is 2160, while the sum is 26.

The square root of 136351421 is about 11676.9611200860. The cubic root of 136351421 is about 514.6988794880.

The spelling of 136351421 in words is "one hundred thirty-six million, three hundred fifty-one thousand, four hundred twenty-one".