136142021 has 4 divisors (see below), whose sum is σ = 137121600. Its totient is φ = 135162444.

The previous prime is 136142009. The next prime is 136142029. The reversal of 136142021 is 120241631.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136142021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136141984 and 136142002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136142029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489581 + ... + 489858.

It is an arithmetic number, because the mean of its divisors is an integer number (34280400).

Almost surely, 2^136142021 is an apocalyptic number.

It is an amenable number.

136142021 is a deficient number, since it is larger than the sum of its proper divisors (979579).

136142021 is an equidigital number, since it uses as much as digits as its factorization.

136142021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979578.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 136142021 is about 11667.9913009909. The cubic root of 136142021 is about 514.4352636915.

Adding to 136142021 its reverse (120241631), we get a palindrome (256383652).

The spelling of 136142021 in words is "one hundred thirty-six million, one hundred forty-two thousand, twenty-one".