21220219211 has 2 divisors, whose sum is σ = 21220219212. Its totient is φ = 21220219210.

The previous prime is 21220219157. The next prime is 21220219219. The reversal of 21220219211 is 11291202212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220219211 - 2⁶ = 21220219147 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220219219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610109605 + 10610109606.

It is an arithmetic number, because the mean of its divisors is an integer number (10610109606).

Almost surely, 2^21220219211 is an apocalyptic number.

21220219211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220219211 is an equidigital number, since it uses as much as digits as its factorization.

21220219211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21220219211 in words is "twenty-one billion, two hundred twenty million, two hundred nineteen thousand, two hundred eleven".