21121110201239 has 2 divisors, whose sum is σ = 21121110201240. Its totient is φ = 21121110201238.

The previous prime is 21121110201211. The next prime is 21121110201251. The reversal of 21121110201239 is 93210201112112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121110201239 is a prime.

It is a super-2 number, since 2×21121110201239² (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 (21121110251239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560555100619 + 10560555100620.

It is an arithmetic number, because the mean of its divisors is an integer number (10560555100620).

Almost surely, 2^{21121110201239} is an apocalyptic number.

21121110201239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121110201239 is an equidigital number, since it uses as much as digits as its factorization.

21121110201239 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 26.

The spelling of 21121110201239 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, two hundred one thousand, two hundred thirty-nine".