20111210121121 has 4 divisors (see below), whose sum is σ = 22984240138432. Its totient is φ = 17238180103812.

The previous prime is 20111210121097. The next prime is 20111210121143. The reversal of 20111210121121 is 12112101211102.

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 20111210121121 - 2⁵ = 20111210121089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111210121095 and 20111210121104.

It is not an unprimeable number, because it can be changed into a prime (20111210121421) 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, 1436515008645 + ... + 1436515008658.

It is an arithmetic number, because the mean of its divisors is an integer number (5746060034608).

Almost surely, 2^{20111210121121} is an apocalyptic number.

It is an amenable number.

20111210121121 is a deficient number, since it is larger than the sum of its proper divisors (2873030017311).

20111210121121 is an equidigital number, since it uses as much as digits as its factorization.

20111210121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873030017310.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 20111210121121 its reverse (12112101211102), we get a palindrome (32223311332223).

The spelling of 20111210121121 in words is "twenty trillion, one hundred eleven billion, two hundred ten million, one hundred twenty-one thousand, one hundred twenty-one".