21112100201 has 4 divisors (see below), whose sum is σ = 21349314900. Its totient is φ = 20874885504.

The previous prime is 21112100179. The next prime is 21112100209. The reversal of 21112100201 is 10200121112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4042416400 + 17069683801 = 63580^2 + 130651^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112100201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112100209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118607216 + ... + 118607393.

It is an arithmetic number, because the mean of its divisors is an integer number (5337328725).

Almost surely, 2^21112100201 is an apocalyptic number.

It is an amenable number.

21112100201 is a deficient number, since it is larger than the sum of its proper divisors (237214699).

21112100201 is an equidigital number, since it uses as much as digits as its factorization.

21112100201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237214698.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21112100201 its reverse (10200121112), we get a palindrome (31312221313).

The spelling of 21112100201 in words is "twenty-one billion, one hundred twelve million, one hundred thousand, two hundred one".