21201112101 has 16 divisors (see below), whose sum is σ = 30744040320. Its totient is φ = 12917659200.

The previous prime is 21201112087. The next prime is 21201112139. The reversal of 21201112101 is 10121110212.

It is not a de Polignac number, because 21201112101 - 2¹³ = 21201103909 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201112151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2687241 + ... + 2695118.

It is an arithmetic number, because the mean of its divisors is an integer number (1921502520).

Almost surely, 2^21201112101 is an apocalyptic number.

It is an amenable number.

21201112101 is a deficient number, since it is larger than the sum of its proper divisors (9542928219).

21201112101 is a wasteful number, since it uses less digits than its factorization.

21201112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5382476.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21201112101 its reverse (10121110212), we get a palindrome (31322222313).

It can be divided in two parts, 2120111 and 2101, that added together give a palindrome (2122212).

The spelling of 21201112101 in words is "twenty-one billion, two hundred one million, one hundred twelve thousand, one hundred one".