21404104049 has 2 divisors, whose sum is σ = 21404104050. Its totient is φ = 21404104048.

The previous prime is 21404104009. The next prime is 21404104081. The reversal of 21404104049 is 94040140412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15229287649 + 6174816400 = 123407^2 + 78580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21404104049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21404104009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702052024 + 10702052025.

It is an arithmetic number, because the mean of its divisors is an integer number (10702052025).

Almost surely, 2^21404104049 is an apocalyptic number.

It is an amenable number.

21404104049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404104049 is an equidigital number, since it uses as much as digits as its factorization.

21404104049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 21404104049 in words is "twenty-one billion, four hundred four million, one hundred four thousand, forty-nine".