21121120021111 has 8 divisors (see below), whose sum is σ = 23206986028800. Its totient is φ = 19062881378040.

The previous prime is 21121120021097. The next prime is 21121120021159. The reversal of 21121120021111 is 11112002112112.

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 21121120021111 - 2³³ = 21112530086519 is a prime.

It is a super-3 number, since 3×21121120021111³ (a number of 41 digits) contains 333 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 (21121120021711) 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, 6906839551 + ... + 6906842608.

It is an arithmetic number, because the mean of its divisors is an integer number (2900873253600).

Almost surely, 2^{21121120021111} is an apocalyptic number.

21121120021111 is a deficient number, since it is larger than the sum of its proper divisors (2085866007689).

21121120021111 is a wasteful number, since it uses less digits than its factorization.

21121120021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13813682309.

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

Adding to 21121120021111 its reverse (11112002112112), we get a palindrome (32233122133223).

The spelling of 21121120021111 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, twenty-one thousand, one hundred eleven".