20412112121 has 8 divisors (see below), whose sum is σ = 20734125120. Its totient is φ = 20092529808.

The previous prime is 20412112073. The next prime is 20412112139. The reversal of 20412112121 is 12121121402.

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-20412112121 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 20412112121.

It is not an unprimeable number, because it can be changed into a prime (20412112421) 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, 590741 + ... + 624338.

It is an arithmetic number, because the mean of its divisors is an integer number (2591765640).

Almost surely, 2^20412112121 is an apocalyptic number.

It is an amenable number.

20412112121 is a deficient number, since it is larger than the sum of its proper divisors (322012999).

20412112121 is a wasteful number, since it uses less digits than its factorization.

20412112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215343.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20412112121 its reverse (12121121402), we get a palindrome (32533233523).

The spelling of 20412112121 in words is "twenty billion, four hundred twelve million, one hundred twelve thousand, one hundred twenty-one".