21222011211 has 4 divisors (see below), whose sum is σ = 28296014952. Its totient is φ = 14148007472.

The previous prime is 21222011201. The next prime is 21222011249. The reversal of 21222011211 is 11211022212.

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 21222011211 - 2⁶ = 21222011147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222011201) 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, 3537001866 + ... + 3537001871.

It is an arithmetic number, because the mean of its divisors is an integer number (7074003738).

Almost surely, 2^21222011211 is an apocalyptic number.

21222011211 is a deficient number, since it is larger than the sum of its proper divisors (7074003741).

21222011211 is an equidigital number, since it uses as much as digits as its factorization.

21222011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7074003740.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21222011211 its reverse (11211022212), we get a palindrome (32433033423).

The spelling of 21222011211 in words is "twenty-one billion, two hundred twenty-two million, eleven thousand, two hundred eleven".