21220033211 has 4 divisors (see below), whose sum is σ = 22852343472. Its totient is φ = 19587722952.

The previous prime is 21220033193. The next prime is 21220033273. The reversal of 21220033211 is 11233002212.

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 21220033211 - 2¹⁴ = 21220016827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21220033211.

It is not an unprimeable number, because it can be changed into a prime (21220033291) 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, 816155111 + ... + 816155136.

It is an arithmetic number, because the mean of its divisors is an integer number (5713085868).

Almost surely, 2^21220033211 is an apocalyptic number.

21220033211 is a deficient number, since it is larger than the sum of its proper divisors (1632310261).

21220033211 is a wasteful number, since it uses less digits than its factorization.

21220033211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632310260.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21220033211 its reverse (11233002212), we get a palindrome (32453035423).

The spelling of 21220033211 in words is "twenty-one billion, two hundred twenty million, thirty-three thousand, two hundred eleven".