21111221100239 has 2 divisors, whose sum is σ = 21111221100240. Its totient is φ = 21111221100238.

The previous prime is 21111221100169. The next prime is 21111221100271. The reversal of 21111221100239 is 93200112211112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111221100239 - 2²⁴ = 21111204323023 is a prime.

It is a super-3 number, since 3×21111221100239³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111221100839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555610550119 + 10555610550120.

It is an arithmetic number, because the mean of its divisors is an integer number (10555610550120).

Almost surely, 2^{21111221100239} is an apocalyptic number.

21111221100239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111221100239 is an equidigital number, since it uses as much as digits as its factorization.

21111221100239 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 21111221100239 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred thousand, two hundred thirty-nine".