20211021112111 has 4 divisors (see below), whose sum is σ = 21274759065400. Its totient is φ = 19147283158824.

The previous prime is 20211021112103. The next prime is 20211021112189. The reversal of 20211021112111 is 11121112011202.

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 20211021112111 - 2³ = 20211021112103 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 (20211021112511) 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, 531868976616 + ... + 531868976653.

It is an arithmetic number, because the mean of its divisors is an integer number (5318689766350).

Almost surely, 2^{20211021112111} is an apocalyptic number.

20211021112111 is a deficient number, since it is larger than the sum of its proper divisors (1063737953289).

20211021112111 is a wasteful number, since it uses less digits than its factorization.

20211021112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063737953288.

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

Adding to 20211021112111 its reverse (11121112011202), we get a palindrome (31332133123313).

The spelling of 20211021112111 in words is "twenty trillion, two hundred eleven billion, twenty-one million, one hundred twelve thousand, one hundred eleven".