21135029 has 8 divisors (see below), whose sum is σ = 22983768. Its totient is φ = 19353600.

The previous prime is 21135013. The next prime is 21135031. The reversal of 21135029 is 92053112.

It can be written as a sum of positive squares in 4 ways, for example, as 3478225 + 17656804 = 1865^2 + 4202^2 .

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 21135029 - 2⁴ = 21135013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21134995 and 21135013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135329) 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, 16172 + ... + 17429.

It is an arithmetic number, because the mean of its divisors is an integer number (2872971).

Almost surely, 2^21135029 is an apocalyptic number.

It is an amenable number.

21135029 is a deficient number, since it is larger than the sum of its proper divisors (1848739).

21135029 is a wasteful number, since it uses less digits than its factorization.

21135029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33655.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 21135029 is about 4597.2849596256. The cubic root of 21135029 is about 276.4824797848.

The spelling of 21135029 in words is "twenty-one million, one hundred thirty-five thousand, twenty-nine".