20120011111121 has 4 divisors (see below), whose sum is σ = 20120210107200. Its totient is φ = 20119812115044.

The previous prime is 20120011111117. The next prime is 20120011111133. The reversal of 20120011111121 is 12111111002102.

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 not a de Polignac number, because 20120011111121 - 2² = 20120011111117 is a prime.

It is a super-2 number, since 2×20120011111121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20120011111096 and 20120011111105.

It is not an unprimeable number, because it can be changed into a prime (20120011111111) 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, 99346301 + ... + 99548618.

It is an arithmetic number, because the mean of its divisors is an integer number (5030052526800).

Almost surely, 2^{20120011111121} is an apocalyptic number.

It is an amenable number.

20120011111121 is a deficient number, since it is larger than the sum of its proper divisors (198996079).

20120011111121 is a wasteful number, since it uses less digits than its factorization.

20120011111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198996078.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20120011111121 its reverse (12111111002102), we get a palindrome (32231122113223).

The spelling of 20120011111121 in words is "twenty trillion, one hundred twenty billion, eleven million, one hundred eleven thousand, one hundred twenty-one".