21102202011211 has 4 divisors (see below), whose sum is σ = 21102279349032. Its totient is φ = 21102124673392.

The previous prime is 21102202011161. The next prime is 21102202011217. The reversal of 21102202011211 is 11211020220112.

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 21102202011211 - 2²³ = 21102193622603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102202011217) 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, 38258170 + ... + 38805823.

It is an arithmetic number, because the mean of its divisors is an integer number (5275569837258).

Almost surely, 2^{21102202011211} is an apocalyptic number.

21102202011211 is a deficient number, since it is larger than the sum of its proper divisors (77337821).

21102202011211 is an equidigital number, since it uses as much as digits as its factorization.

21102202011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77337820.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21102202011211 its reverse (11211020220112), we get a palindrome (32313222231323).

The spelling of 21102202011211 in words is "twenty-one trillion, one hundred two billion, two hundred two million, eleven thousand, two hundred eleven".