21222020211 has 16 divisors (see below), whose sum is σ = 32408479488. Its totient is φ = 12100557600.

The previous prime is 21222020153. The next prime is 21222020219. The reversal of 21222020211 is 11202022212.

It is not a de Polignac number, because 21222020211 - 2⁶ = 21222020147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222020219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1086385 + ... + 1105746.

It is an arithmetic number, because the mean of its divisors is an integer number (2025529968).

Almost surely, 2^21222020211 is an apocalyptic number.

21222020211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21222020211 is a deficient number, since it is larger than the sum of its proper divisors (11186459277).

21222020211 is a wasteful number, since it uses less digits than its factorization.

21222020211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192602.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21222020211 its reverse (11202022212), we get a palindrome (32424042423).

The spelling of 21222020211 in words is "twenty-one billion, two hundred twenty-two million, twenty thousand, two hundred eleven".