20121121112021 has 8 divisors (see below), whose sum is σ = 20193016234560. Its totient is φ = 20049231593952.

The previous prime is 20121121112003. The next prime is 20121121112089. The reversal of 20121121112021 is 12021112112102.

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 20121121112021 - 2²⁶ = 20121054003157 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 (20121121117021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5859176 + ... + 8635518.

It is an arithmetic number, because the mean of its divisors is an integer number (2524127029320).

Almost surely, 2^{20121121112021} is an apocalyptic number.

It is an amenable number.

20121121112021 is a deficient number, since it is larger than the sum of its proper divisors (71895122539).

20121121112021 is a wasteful number, since it uses less digits than its factorization.

20121121112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802235.

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

Adding to 20121121112021 its reverse (12021112112102), we get a palindrome (32142233224123).

The spelling of 20121121112021 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred twelve thousand, twenty-one".