20011102121 has 4 divisors (see below), whose sum is σ = 20017041744. Its totient is φ = 20005162500.

The previous prime is 20011102109. The next prime is 20011102127. The reversal of 20011102121 is 12120111002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011102121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011102127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2964755 + ... + 2971496.

It is an arithmetic number, because the mean of its divisors is an integer number (5004260436).

Almost surely, 2^20011102121 is an apocalyptic number.

It is an amenable number.

20011102121 is a deficient number, since it is larger than the sum of its proper divisors (5939623).

20011102121 is an equidigital number, since it uses as much as digits as its factorization.

20011102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5939622.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20011102121 its reverse (12120111002), we get a palindrome (32131213123).

The spelling of 20011102121 in words is "twenty billion, eleven million, one hundred two thousand, one hundred twenty-one".