21211120111 has 8 divisors (see below), whose sum is σ = 21929528448. Its totient is φ = 20494848000.

The previous prime is 21211120081. The next prime is 21211120121. The reversal of 21211120111 is 11102111212.

It is a happy number.

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 21211120111 - 2¹³ = 21211111919 is a prime.

It is a super-3 number, since 3×21211120111³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21211120091 and 21211120100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211120121) 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, 513850 + ... + 553591.

It is an arithmetic number, because the mean of its divisors is an integer number (2741191056).

Almost surely, 2^21211120111 is an apocalyptic number.

21211120111 is a deficient number, since it is larger than the sum of its proper divisors (718408337).

21211120111 is a wasteful number, since it uses less digits than its factorization.

21211120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068113.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21211120111 its reverse (11102111212), we get a palindrome (32313231323).

It can be divided in two parts, 212111201 and 11, that added together give a palindrome (212111212).

The spelling of 21211120111 in words is "twenty-one billion, two hundred eleven million, one hundred twenty thousand, one hundred eleven".