21102110133 has 24 divisors (see below), whose sum is σ = 31210079040. Its totient is φ = 12669171840.

The previous prime is 21102110123. The next prime is 21102110171. The reversal of 21102110133 is 33101120112.

It is a happy number.

It is not a de Polignac number, because 21102110133 - 2²² = 21097915829 is a prime.

It is a super-2 number, since 2×21102110133² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102110123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 486793 + ... + 528366.

It is an arithmetic number, because the mean of its divisors is an integer number (1300419960).

Almost surely, 2^21102110133 is an apocalyptic number.

It is an amenable number.

21102110133 is a deficient number, since it is larger than the sum of its proper divisors (10107968907).

21102110133 is a wasteful number, since it uses less digits than its factorization.

21102110133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015229 (or 1015216 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21102110133 its reverse (33101120112), we get a palindrome (54203230245).

The spelling of 21102110133 in words is "twenty-one billion, one hundred two million, one hundred ten thousand, one hundred thirty-three".