20111122010121 has 4 divisors (see below), whose sum is σ = 26814829346832. Its totient is φ = 13407414673412.

The previous prime is 20111122010113. The next prime is 20111122010131. The reversal of 20111122010121 is 12101022111102.

It is a happy number.

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 20111122010121 - 2³ = 20111122010113 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111122010121.

It is not an unprimeable number, because it can be changed into a prime (20111122010101) 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, 3351853668351 + ... + 3351853668356.

It is an arithmetic number, because the mean of its divisors is an integer number (6703707336708).

Almost surely, 2^{20111122010121} is an apocalyptic number.

It is an amenable number.

20111122010121 is a deficient number, since it is larger than the sum of its proper divisors (6703707336711).

20111122010121 is an equidigital number, since it uses as much as digits as its factorization.

20111122010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6703707336710.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20111122010121 its reverse (12101022111102), we get a palindrome (32212144121223).

The spelling of 20111122010121 in words is "twenty trillion, one hundred eleven billion, one hundred twenty-two million, ten thousand, one hundred twenty-one".