21122410211 has 4 divisors (see below), whose sum is σ = 24139897392. Its totient is φ = 18104923032.

The previous prime is 21122410147. The next prime is 21122410229. The reversal of 21122410211 is 11201422112.

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

It is not a de Polignac number, because 21122410211 - 2⁶ = 21122410147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21122410211.

It is not an unprimeable number, because it can be changed into a prime (21122410241) 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, 1508743580 + ... + 1508743593.

It is an arithmetic number, because the mean of its divisors is an integer number (6034974348).

Almost surely, 2^21122410211 is an apocalyptic number.

21122410211 is a deficient number, since it is larger than the sum of its proper divisors (3017487181).

21122410211 is an equidigital number, since it uses as much as digits as its factorization.

21122410211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3017487180.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21122410211 its reverse (11201422112), we get a palindrome (32323832323).

The spelling of 21122410211 in words is "twenty-one billion, one hundred twenty-two million, four hundred ten thousand, two hundred eleven".