21709232135 has 16 divisors (see below), whose sum is σ = 29035260000. Its totient is φ = 15485469696.

The previous prime is 21709232117. The next prime is 21709232189. The reversal of 21709232135 is 53123290712.

It is a cyclic number.

It is not a de Polignac number, because 21709232135 - 2⁶ = 21709232071 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21709232095 and 21709232104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6719510 + ... + 6722739.

It is an arithmetic number, because the mean of its divisors is an integer number (1814703750).

Almost surely, 2^21709232135 is an apocalyptic number.

21709232135 is a deficient number, since it is larger than the sum of its proper divisors (7326027865).

21709232135 is a wasteful number, since it uses less digits than its factorization.

21709232135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13442290.

The product of its (nonzero) digits is 22680, while the sum is 35.

The spelling of 21709232135 in words is "twenty-one billion, seven hundred nine million, two hundred thirty-two thousand, one hundred thirty-five".