20121021113 has 8 divisors (see below), whose sum is σ = 20166558720. Its totient is φ = 20075535360.

The previous prime is 20121021101. The next prime is 20121021139. The reversal of 20121021113 is 31112012102.

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 20121021113 - 2²² = 20116826809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20121026113) 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, 823868 + ... + 847938.

It is an arithmetic number, because the mean of its divisors is an integer number (2520819840).

Almost surely, 2^20121021113 is an apocalyptic number.

It is an amenable number.

20121021113 is a deficient number, since it is larger than the sum of its proper divisors (45537607).

20121021113 is a wasteful number, since it uses less digits than its factorization.

20121021113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25927.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20121021113 its reverse (31112012102), we get a palindrome (51233033215).

The spelling of 20121021113 in words is "twenty billion, one hundred twenty-one million, twenty-one thousand, one hundred thirteen".