21311200123253 has 2 divisors, whose sum is σ = 21311200123254. Its totient is φ = 21311200123252.

The previous prime is 21311200123247. The next prime is 21311200123273. The reversal of 21311200123253 is 35232100211312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17896901803729 + 3414298319524 = 4230473^2 + 1847782^2 .

It is a cyclic number.

It is not a de Polignac number, because 21311200123253 - 2¹⁴ = 21311200106869 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21311200123273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655600061626 + 10655600061627.

It is an arithmetic number, because the mean of its divisors is an integer number (10655600061627).

Almost surely, 2^{21311200123253} is an apocalyptic number.

It is an amenable number.

21311200123253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311200123253 is an equidigital number, since it uses as much as digits as its factorization.

21311200123253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21311200123253 its reverse (35232100211312), we get a palindrome (56543300334565).

The spelling of 21311200123253 in words is "twenty-one trillion, three hundred eleven billion, two hundred million, one hundred twenty-three thousand, two hundred fifty-three".