21201102211 has 4 divisors (see below), whose sum is σ = 21235353400. Its totient is φ = 21166851024.

The previous prime is 21201102137. The next prime is 21201102229. The reversal of 21201102211 is 11220110212.

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

It is a cyclic number.

It is not a de Polignac number, because 21201102211 - 2²¹ = 21199005059 is a prime.

It is a super-2 number, since 2×21201102211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201102191 and 21201102200.

It is not an unprimeable number, because it can be changed into a prime (21201102281) 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, 17124666 + ... + 17125903.

It is an arithmetic number, because the mean of its divisors is an integer number (5308838350).

Almost surely, 2^21201102211 is an apocalyptic number.

21201102211 is a deficient number, since it is larger than the sum of its proper divisors (34251189).

21201102211 is an equidigital number, since it uses as much as digits as its factorization.

21201102211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34251188.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21201102211 its reverse (11220110212), we get a palindrome (32421212423).

The spelling of 21201102211 in words is "twenty-one billion, two hundred one million, one hundred two thousand, two hundred eleven".