21220220111 has 8 divisors (see below), whose sum is σ = 21337121040. Its totient is φ = 21103391232.

The previous prime is 21220220059. The next prime is 21220220137. The reversal of 21220220111 is 11102202212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220220111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220220611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637856 + ... + 670298.

It is an arithmetic number, because the mean of its divisors is an integer number (2667140130).

Almost surely, 2^21220220111 is an apocalyptic number.

21220220111 is a deficient number, since it is larger than the sum of its proper divisors (116900929).

21220220111 is a wasteful number, since it uses less digits than its factorization.

21220220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36025.

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

Adding to 21220220111 its reverse (11102202212), we get a palindrome (32322422323).

It can be divided in two parts, 212202201 and 11, that added together give a palindrome (212202212).

The spelling of 21220220111 in words is "twenty-one billion, two hundred twenty million, two hundred twenty thousand, one hundred eleven".