21004424179 has 2 divisors, whose sum is σ = 21004424180. Its totient is φ = 21004424178.

The previous prime is 21004424131. The next prime is 21004424191. The reversal of 21004424179 is 97142440012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21004424179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21004124179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502212089 + 10502212090.

It is an arithmetic number, because the mean of its divisors is an integer number (10502212090).

Almost surely, 2^21004424179 is an apocalyptic number.

21004424179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004424179 is an equidigital number, since it uses as much as digits as its factorization.

21004424179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 21004424179 in words is "twenty-one billion, four million, four hundred twenty-four thousand, one hundred seventy-nine".