136040921 has 4 divisors (see below), whose sum is σ = 136065552. Its totient is φ = 136016292.

The previous prime is 136040903. The next prime is 136040963. The reversal of 136040921 is 129040631.

136040921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 136040921 - 2⁶ = 136040857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136040981) 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, 230 + ... + 16496.

It is an arithmetic number, because the mean of its divisors is an integer number (34016388).

Almost surely, 2^136040921 is an apocalyptic number.

It is an amenable number.

136040921 is a deficient number, since it is larger than the sum of its proper divisors (24631).

136040921 is an equidigital number, since it uses as much as digits as its factorization.

136040921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24630.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 136040921 is about 11663.6581311354. The cubic root of 136040921 is about 514.3078911035.

The spelling of 136040921 in words is "one hundred thirty-six million, forty thousand, nine hundred twenty-one".