21116144029 has 2 divisors, whose sum is σ = 21116144030. Its totient is φ = 21116144028.

The previous prime is 21116144011. The next prime is 21116144053. The reversal of 21116144029 is 92044161112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14112964804 + 7003179225 = 118798^2 + 83685^2 .

It is a cyclic number.

It is not a de Polignac number, because 21116144029 - 2¹⁹ = 21115619741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21116144069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558072014 + 10558072015.

It is an arithmetic number, because the mean of its divisors is an integer number (10558072015).

Almost surely, 2^21116144029 is an apocalyptic number.

It is an amenable number.

21116144029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116144029 is an equidigital number, since it uses as much as digits as its factorization.

21116144029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 21116144029 in words is "twenty-one billion, one hundred sixteen million, one hundred forty-four thousand, twenty-nine".