136342121 has 4 divisors (see below), whose sum is σ = 139512912. Its totient is φ = 133171332.

The previous prime is 136342111. The next prime is 136342127. The reversal of 136342121 is 121243631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121243631 = 2213 ⋅54787.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136342121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136342127) 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, 1585331 + ... + 1585416.

It is an arithmetic number, because the mean of its divisors is an integer number (34878228).

Almost surely, 2^136342121 is an apocalyptic number.

It is an amenable number.

136342121 is a deficient number, since it is larger than the sum of its proper divisors (3170791).

136342121 is an equidigital number, since it uses as much as digits as its factorization.

136342121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170790.

The product of its digits is 864, while the sum is 23.

The square root of 136342121 is about 11676.5628932490. The cubic root of 136342121 is about 514.6871773525.

Adding to 136342121 its reverse (121243631), we get a palindrome (257585752).

The spelling of 136342121 in words is "one hundred thirty-six million, three hundred forty-two thousand, one hundred twenty-one".