21121111112039 has 2 divisors, whose sum is σ = 21121111112040. Its totient is φ = 21121111112038.

The previous prime is 21121111112029. The next prime is 21121111112051. The reversal of 21121111112039 is 93021111112112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121111112039 is a prime.

It is a super-2 number, since 2×21121111112039² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121111111999 and 21121111112017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121111112029) 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, 10560555556019 + 10560555556020.

It is an arithmetic number, because the mean of its divisors is an integer number (10560555556020).

Almost surely, 2^{21121111112039} is an apocalyptic number.

21121111112039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121111112039 is an equidigital number, since it uses as much as digits as its factorization.

21121111112039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 26.

The spelling of 21121111112039 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, thirty-nine".