21112020121111 has 8 divisors (see below), whose sum is σ = 21318663520544. Its totient is φ = 20905408882080.

The previous prime is 21112020121103. The next prime is 21112020121151. The reversal of 21112020121111 is 11112102021112.

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 21112020121111 - 2³ = 21112020121103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112020121151) 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, 6719700 + ... + 9347641.

It is an arithmetic number, because the mean of its divisors is an integer number (2664832940068).

Almost surely, 2^{21112020121111} is an apocalyptic number.

21112020121111 is a deficient number, since it is larger than the sum of its proper divisors (206643399433).

21112020121111 is a wasteful number, since it uses less digits than its factorization.

21112020121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16080201.

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

Adding to 21112020121111 its reverse (11112102021112), we get a palindrome (32224122142223).

The spelling of 21112020121111 in words is "twenty-one trillion, one hundred twelve billion, twenty million, one hundred twenty-one thousand, one hundred eleven".