21108101 has 8 divisors (see below), whose sum is σ = 25542720. Its totient is φ = 17028288.

The previous prime is 21108097. The next prime is 21108103. The reversal of 21108101 is 10180112.

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

It is not a de Polignac number, because 21108101 - 2² = 21108097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21108103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88571 + ... + 88808.

It is an arithmetic number, because the mean of its divisors is an integer number (3192840).

Almost surely, 2^21108101 is an apocalyptic number.

It is an amenable number.

21108101 is a deficient number, since it is larger than the sum of its proper divisors (4434619).

21108101 is a wasteful number, since it uses less digits than its factorization.

21108101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177403.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 21108101 is about 4594.3553410680. The cubic root of 21108101 is about 276.3650083841.

Adding to 21108101 its reverse (10180112), we get a palindrome (31288213).

The spelling of 21108101 in words is "twenty-one million, one hundred eight thousand, one hundred one".