20111230233121 has 2 divisors, whose sum is σ = 20111230233122. Its totient is φ = 20111230233120.

The previous prime is 20111230233113. The next prime is 20111230233139. The reversal of 20111230233121 is 12133203211102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15207574296721 + 4903655936400 = 3899689^2 + 2214420^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111230233121 - 2³ = 20111230233113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20111230233092 and 20111230233101.

It is not a weakly prime, because it can be changed into another prime (20111230233161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055615116560 + 10055615116561.

It is an arithmetic number, because the mean of its divisors is an integer number (10055615116561).

Almost surely, 2^{20111230233121} is an apocalyptic number.

It is an amenable number.

20111230233121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111230233121 is an equidigital number, since it uses as much as digits as its factorization.

20111230233121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 20111230233121 its reverse (12133203211102), we get a palindrome (32244433444223).

The spelling of 20111230233121 in words is "twenty trillion, one hundred eleven billion, two hundred thirty million, two hundred thirty-three thousand, one hundred twenty-one".