21112120202111 has 8 divisors (see below), whose sum is σ = 22030085483520. Its totient is φ = 20194158838392.

The previous prime is 21112120202099. The next prime is 21112120202113. The reversal of 21112120202111 is 11120202121112.

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 21112120202111 - 2²⁶ = 21112053093247 is a prime.

It is a super-2 number, since 2×21112120202111² (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 21112120202111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112120202113) 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, 17259386 + ... + 18442088.

It is an arithmetic number, because the mean of its divisors is an integer number (2753760685440).

Almost surely, 2^{21112120202111} is an apocalyptic number.

21112120202111 is a deficient number, since it is larger than the sum of its proper divisors (917965281409).

21112120202111 is a wasteful number, since it uses less digits than its factorization.

21112120202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958845.

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

Adding to 21112120202111 its reverse (11120202121112), we get a palindrome (32232322323223).

The spelling of 21112120202111 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty million, two hundred two thousand, one hundred eleven".