20021121112111 has 8 divisors (see below), whose sum is σ = 22881501991040. Its totient is φ = 17160795413208.

The previous prime is 20021121112103. The next prime is 20021121112123. The reversal of 20021121112111 is 11121112112002.

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 20021121112111 - 2³ = 20021121112103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021121112211) 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, 13014561 + ... + 14471386.

It is an arithmetic number, because the mean of its divisors is an integer number (2860187748880).

Almost surely, 2^{20021121112111} is an apocalyptic number.

20021121112111 is a deficient number, since it is larger than the sum of its proper divisors (2860380878929).

20021121112111 is a wasteful number, since it uses less digits than its factorization.

20021121112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27590013.

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

Adding to 20021121112111 its reverse (11121112112002), we get a palindrome (31142233224113).

The spelling of 20021121112111 in words is "twenty trillion, twenty-one billion, one hundred twenty-one million, one hundred twelve thousand, one hundred eleven".