21122021201111 has 8 divisors (see below), whose sum is σ = 21864713730480. Its totient is φ = 20380285136512.

The previous prime is 21122021201077. The next prime is 21122021201159. The reversal of 21122021201111 is 11110212022112.

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 21122021201111 - 2¹⁰ = 21122021200087 is a prime.

It is a super-2 number, since 2×21122021201111² (a number of 27 digits) contains 22 as substring.

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 21122021201111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122021201191) 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, 239071250 + ... + 239159583.

It is an arithmetic number, because the mean of its divisors is an integer number (2733089216310).

Almost surely, 2^{21122021201111} is an apocalyptic number.

21122021201111 is a deficient number, since it is larger than the sum of its proper divisors (742692529369).

21122021201111 is a wasteful number, since it uses less digits than its factorization.

21122021201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478232385.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21122021201111 its reverse (11110212022112), we get a palindrome (32232233223223).

The spelling of 21122021201111 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, two hundred one thousand, one hundred eleven".