21111144029 has 2 divisors, whose sum is σ = 21111144030. Its totient is φ = 21111144028.

The previous prime is 21111144013. The next prime is 21111144031. The reversal of 21111144029 is 92044111112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17331722500 + 3779421529 = 131650^2 + 61477^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111144029 - 2⁴ = 21111144013 is a prime.

Together with 21111144031, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111143989 and 21111144007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111144829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555572014 + 10555572015.

It is an arithmetic number, because the mean of its divisors is an integer number (10555572015).

Almost surely, 2^21111144029 is an apocalyptic number.

It is an amenable number.

21111144029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111144029 is an equidigital number, since it uses as much as digits as its factorization.

21111144029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 21111144029 in words is "twenty-one billion, one hundred eleven million, one hundred forty-four thousand, twenty-nine".