135550021 has 8 divisors (see below), whose sum is σ = 139530240. Its totient is φ = 131615568.

The previous prime is 135550013. The next prime is 135550033. The reversal of 135550021 is 120055531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135550021 - 2³ = 135550013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135549974 and 135550001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135550091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5386 + ... + 17323.

It is an arithmetic number, because the mean of its divisors is an integer number (17441280).

Almost surely, 2^135550021 is an apocalyptic number.

It is an amenable number.

135550021 is a deficient number, since it is larger than the sum of its proper divisors (3980219).

135550021 is a wasteful number, since it uses less digits than its factorization.

135550021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22883.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 135550021 is about 11642.5951144923. The cubic root of 135550021 is about 513.6885234561.

The spelling of 135550021 in words is "one hundred thirty-five million, five hundred fifty thousand, twenty-one".