21419374129 has 2 divisors, whose sum is σ = 21419374130. Its totient is φ = 21419374128.

The previous prime is 21419374099. The next prime is 21419374153. The reversal of 21419374129 is 92147391412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13075465104 + 8343909025 = 114348^2 + 91345^2 .

It is a cyclic number.

It is not a de Polignac number, because 21419374129 - 2²³ = 21410985521 is a prime.

It is not a weakly prime, because it can be changed into another prime (21419374729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10709687064 + 10709687065.

It is an arithmetic number, because the mean of its divisors is an integer number (10709687065).

Almost surely, 2^21419374129 is an apocalyptic number.

It is an amenable number.

21419374129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21419374129 is an equidigital number, since it uses as much as digits as its factorization.

21419374129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The spelling of 21419374129 in words is "twenty-one billion, four hundred nineteen million, three hundred seventy-four thousand, one hundred twenty-nine".