21115335101 has 8 divisors (see below), whose sum is σ = 24153939264. Its totient is φ = 18082262880.

The previous prime is 21115335077. The next prime is 21115335161. The reversal of 21115335101 is 10153351112.

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 21115335101 - 2³⁴ = 3935465917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115335161) by changing a digit.

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, 1374800 + ... + 1390073.

It is an arithmetic number, because the mean of its divisors is an integer number (3019242408).

Almost surely, 2^21115335101 is an apocalyptic number.

It is an amenable number.

21115335101 is a deficient number, since it is larger than the sum of its proper divisors (3038604163).

21115335101 is a wasteful number, since it uses less digits than its factorization.

21115335101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2765971.

The product of its (nonzero) digits is 450, while the sum is 23.

Adding to 21115335101 its reverse (10153351112), we get a palindrome (31268686213).

The spelling of 21115335101 in words is "twenty-one billion, one hundred fifteen million, three hundred thirty-five thousand, one hundred one".