136653021 has 16 divisors (see below), whose sum is σ = 214358400. Its totient is φ = 85742784.

The previous prime is 136652981. The next prime is 136653091. The reversal of 136653021 is 120356631.

136653021 is a `hidden beast` number, since 1 + 3 + 6 + 653 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 136653021 - 2¹³ = 136644829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136653091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148401 + ... + 149318.

It is an arithmetic number, because the mean of its divisors is an integer number (13397400).

Almost surely, 2^136653021 is an apocalyptic number.

It is an amenable number.

136653021 is a deficient number, since it is larger than the sum of its proper divisors (77705379).

136653021 is a wasteful number, since it uses less digits than its factorization.

136653021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297745 (or 297739 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 136653021 is about 11689.8683055028. The cubic root of 136653021 is about 515.0780929115.

The spelling of 136653021 in words is "one hundred thirty-six million, six hundred fifty-three thousand, twenty-one".