21220211211 has 8 divisors (see below), whose sum is σ = 28463038464. Its totient is φ = 14062095720.

The previous prime is 21220211167. The next prime is 21220211219. The reversal of 21220211211 is 11211202212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21220211211 - 2⁶ = 21220211147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220211219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21177355 + ... + 21178356.

It is an arithmetic number, because the mean of its divisors is an integer number (3557879808).

Almost surely, 2^21220211211 is an apocalyptic number.

21220211211 is a deficient number, since it is larger than the sum of its proper divisors (7242827253).

21220211211 is a wasteful number, since it uses less digits than its factorization.

21220211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42355881.

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

Adding to 21220211211 its reverse (11211202212), we get a palindrome (32431413423).

The spelling of 21220211211 in words is "twenty-one billion, two hundred twenty million, two hundred eleven thousand, two hundred eleven".