21655235115101 has 8 divisors (see below), whose sum is σ = 24748871553024. Its totient is φ = 18561606532560.

The previous prime is 21655235115091. The next prime is 21655235115109. The reversal of 21655235115101 is 10151153255612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21655235115101 - 2²² = 21655230920797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655235115109) 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, 6213431 + ... + 9050811.

It is an arithmetic number, because the mean of its divisors is an integer number (3093608944128).

Almost surely, 2^{21655235115101} is an apocalyptic number.

It is an amenable number.

21655235115101 is a deficient number, since it is larger than the sum of its proper divisors (3093636437923).

21655235115101 is a wasteful number, since it uses less digits than its factorization.

21655235115101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3927691.

The product of its (nonzero) digits is 45000, while the sum is 38.

The spelling of 21655235115101 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred thirty-five million, one hundred fifteen thousand, one hundred one".