21235135115 has 8 divisors (see below), whose sum is σ = 26981112960. Its totient is φ = 15988807552.

The previous prime is 21235135099. The next prime is 21235135123. The reversal of 21235135115 is 51153153212.

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 21235135115 - 2⁴ = 21235135099 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124912475 + ... + 124912644.

It is an arithmetic number, because the mean of its divisors is an integer number (3372639120).

Almost surely, 2^21235135115 is an apocalyptic number.

21235135115 is a deficient number, since it is larger than the sum of its proper divisors (5745977845).

21235135115 is a wasteful number, since it uses less digits than its factorization.

21235135115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249825141.

The product of its digits is 4500, while the sum is 29.

Adding to 21235135115 its reverse (51153153212), we get a palindrome (72388288327).

The spelling of 21235135115 in words is "twenty-one billion, two hundred thirty-five million, one hundred thirty-five thousand, one hundred fifteen".