21115156135 has 8 divisors (see below), whose sum is σ = 25345832400. Its totient is φ = 16887028224.

The previous prime is 21115156129. The next prime is 21115156163. The reversal of 21115156135 is 53165151112.

It is a happy number.

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 21115156135 - 2¹³ = 21115147943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21115156097 and 21115156106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618810 + ... + 652039.

It is an arithmetic number, because the mean of its divisors is an integer number (3168229050).

Almost surely, 2^21115156135 is an apocalyptic number.

21115156135 is a deficient number, since it is larger than the sum of its proper divisors (4230676265).

21115156135 is a wasteful number, since it uses less digits than its factorization.

21115156135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274177.

The product of its digits is 4500, while the sum is 31.

The spelling of 21115156135 in words is "twenty-one billion, one hundred fifteen million, one hundred fifty-six thousand, one hundred thirty-five".