21121200111239 has 2 divisors, whose sum is σ = 21121200111240. Its totient is φ = 21121200111238.

The previous prime is 21121200111161. The next prime is 21121200111247. The reversal of 21121200111239 is 93211100212112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121200111239 is a prime.

It is a super-2 number, since 2×21121200111239² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121200110239) 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, 10560600055619 + 10560600055620.

It is an arithmetic number, because the mean of its divisors is an integer number (10560600055620).

Almost surely, 2^{21121200111239} is an apocalyptic number.

21121200111239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121200111239 is an equidigital number, since it uses as much as digits as its factorization.

21121200111239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 26.

The spelling of 21121200111239 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred million, one hundred eleven thousand, two hundred thirty-nine".