21102201211 has 24 divisors (see below), whose sum is σ = 27410871264. Its totient is φ = 15817472640.

The previous prime is 21102201187. The next prime is 21102201217. The reversal of 21102201211 is 11210220112.

It is not a de Polignac number, because 21102201211 - 2⁵ = 21102201179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21102201191 and 21102201200.

It is not an unprimeable number, because it can be changed into a prime (21102201217) 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, 288330 + ... + 354031.

It is an arithmetic number, because the mean of its divisors is an integer number (1142119636).

Almost surely, 2^21102201211 is an apocalyptic number.

21102201211 is a deficient number, since it is larger than the sum of its proper divisors (6308670053).

21102201211 is a wasteful number, since it uses less digits than its factorization.

21102201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642419 (or 642400 counting only the distinct ones).

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

Adding to 21102201211 its reverse (11210220112), we get a palindrome (32312421323).

The spelling of 21102201211 in words is "twenty-one billion, one hundred two million, two hundred one thousand, two hundred eleven".