21220000001111 has 4 divisors (see below), whose sum is σ = 22468235295312. Its totient is φ = 19971764706912.

The previous prime is 21220000000951. The next prime is 21220000001113. The reversal of 21220000001111 is 11110000002212.

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 21220000001111 - 2¹⁸ = 21219999738967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220000001092 and 21220000001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220000001113) 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, 624117647075 + ... + 624117647108.

It is an arithmetic number, because the mean of its divisors is an integer number (5617058823828).

Almost surely, 2^{21220000001111} is an apocalyptic number.

21220000001111 is a deficient number, since it is larger than the sum of its proper divisors (1248235294201).

21220000001111 is a wasteful number, since it uses less digits than its factorization.

21220000001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248235294200.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21220000001111 its reverse (11110000002212), we get a palindrome (32330000003323).

The spelling of 21220000001111 in words is "twenty-one trillion, two hundred twenty billion, one thousand, one hundred eleven".