21221200111 has 8 divisors (see below), whose sum is σ = 22546874880. Its totient is φ = 19916402328.

The previous prime is 21221200069. The next prime is 21221200157. The reversal of 21221200111 is 11100212212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221200111 - 2⁹ = 21221199599 is a prime.

It is a super-2 number, since 2×21221200111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221200091 and 21221200100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221200211) 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 7 ways as a sum of consecutive naturals, for example, 5217151 + ... + 5221216.

It is an arithmetic number, because the mean of its divisors is an integer number (2818359360).

Almost surely, 2^21221200111 is an apocalyptic number.

21221200111 is a deficient number, since it is larger than the sum of its proper divisors (1325674769).

21221200111 is a wasteful number, since it uses less digits than its factorization.

21221200111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10438493.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21221200111 its reverse (11100212212), we get a palindrome (32321412323).

The spelling of 21221200111 in words is "twenty-one billion, two hundred twenty-one million, two hundred thousand, one hundred eleven".