21012220211 has 2 divisors, whose sum is σ = 21012220212. Its totient is φ = 21012220210.

The previous prime is 21012220183. The next prime is 21012220223. The reversal of 21012220211 is 11202221012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012220211 - 2¹⁴ = 21012203827 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012220241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506110105 + 10506110106.

It is an arithmetic number, because the mean of its divisors is an integer number (10506110106).

Almost surely, 2^21012220211 is an apocalyptic number.

21012220211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012220211 is an equidigital number, since it uses as much as digits as its factorization.

21012220211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21012220211 its reverse (11202221012), we get a palindrome (32214441223).

The spelling of 21012220211 in words is "twenty-one billion, twelve million, two hundred twenty thousand, two hundred eleven".