135366021 has 48 divisors (see below), whose sum is σ = 231289344. Its totient is φ = 74686752.

The previous prime is 135365959. The next prime is 135366029. The reversal of 135366021 is 120663531.

135366021 is a `hidden beast` number, since 1 + 3 + 53 + 6 + 602 + 1 = 666.

It is not a de Polignac number, because 135366021 - 2¹⁰ = 135364997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135366029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 289630 + ... + 290096.

It is an arithmetic number, because the mean of its divisors is an integer number (4818528).

Almost surely, 2^135366021 is an apocalyptic number.

It is an amenable number.

135366021 is a deficient number, since it is larger than the sum of its proper divisors (95923323).

135366021 is a wasteful number, since it uses less digits than its factorization.

135366021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 627 counting only the distinct ones).

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

The square root of 135366021 is about 11634.6904127269. The cubic root of 135366021 is about 513.4559857123.

The spelling of 135366021 in words is "one hundred thirty-five million, three hundred sixty-six thousand, twenty-one".