21221000221111 has 8 divisors (see below), whose sum is σ = 21624996142944. Its totient is φ = 20817137621280.

The previous prime is 21221000221093. The next prime is 21221000221117. The reversal of 21221000221111 is 11112200012212.

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 21221000221111 - 2¹⁹ = 21220999696823 is a prime.

It is a super-4 number, since 4×21221000221111⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221000221117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33009100 + ... + 33645841.

It is an arithmetic number, because the mean of its divisors is an integer number (2703124517868).

Almost surely, 2^{21221000221111} is an apocalyptic number.

21221000221111 is a deficient number, since it is larger than the sum of its proper divisors (403995921833).

21221000221111 is an equidigital number, since it uses as much as digits as its factorization.

21221000221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66661001.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221000221111 its reverse (11112200012212), we get a palindrome (32333200233323).

The spelling of 21221000221111 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one thousand, one hundred eleven".