135051021 has 12 divisors (see below), whose sum is σ = 222941472. Its totient is φ = 77171976.

The previous prime is 135051019. The next prime is 135051079. The reversal of 135051021 is 120150531.

135051021 is a `hidden beast` number, since 135 + 0 + 510 + 21 = 666.

It is not a de Polignac number, because 135051021 - 2¹ = 135051019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135050985 and 135051003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135051001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1071771 + ... + 1071896.

It is an arithmetic number, because the mean of its divisors is an integer number (18578456).

Almost surely, 2^135051021 is an apocalyptic number.

It is an amenable number.

135051021 is a deficient number, since it is larger than the sum of its proper divisors (87890451).

135051021 is a wasteful number, since it uses less digits than its factorization.

135051021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143680 (or 2143677 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 135051021 is about 11621.1454254733. The cubic root of 135051021 is about 513.0574015543.

It can be divided in two parts, 1350510 and 21, that added together give a palindrome (1350531).

The spelling of 135051021 in words is "one hundred thirty-five million, fifty-one thousand, twenty-one".