20211121111121 has 8 divisors (see below), whose sum is σ = 20792389849920. Its totient is φ = 19637257069872.

The previous prime is 20211121111099. The next prime is 20211121111123. The reversal of 20211121111121 is 12111112111202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211121111121 is a prime.

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 20211121111121.

It is not an unprimeable number, because it can be changed into a prime (20211121111123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1851168851 + ... + 1851179768.

It is an arithmetic number, because the mean of its divisors is an integer number (2599048731240).

Almost surely, 2^{20211121111121} is an apocalyptic number.

It is an amenable number.

20211121111121 is a deficient number, since it is larger than the sum of its proper divisors (581268738799).

20211121111121 is a wasteful number, since it uses less digits than its factorization.

20211121111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3702348775.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 20211121111121 its reverse (12111112111202), we get a palindrome (32322233222323).

The spelling of 20211121111121 in words is "twenty trillion, two hundred eleven billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-one".