21124231213361 has 2 divisors, whose sum is σ = 21124231213362. Its totient is φ = 21124231213360.

The previous prime is 21124231213307. The next prime is 21124231213381. The reversal of 21124231213361 is 16331213242112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20224448065600 + 899783147761 = 4497160^2 + 948569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21124231213361 is a prime.

It is not a weakly prime, because it can be changed into another prime (21124231213381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562115606680 + 10562115606681.

It is an arithmetic number, because the mean of its divisors is an integer number (10562115606681).

Almost surely, 2^{21124231213361} is an apocalyptic number.

It is an amenable number.

21124231213361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124231213361 is an equidigital number, since it uses as much as digits as its factorization.

21124231213361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

Adding to 21124231213361 its reverse (16331213242112), we get a palindrome (37455444455473).

The spelling of 21124231213361 in words is "twenty-one trillion, one hundred twenty-four billion, two hundred thirty-one million, two hundred thirteen thousand, three hundred sixty-one".