20404421179 has 2 divisors, whose sum is σ = 20404421180. Its totient is φ = 20404421178.

The previous prime is 20404421171. The next prime is 20404421209. The reversal of 20404421179 is 97112440402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20404421179 - 2³ = 20404421171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20404421171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202210589 + 10202210590.

It is an arithmetic number, because the mean of its divisors is an integer number (10202210590).

Almost surely, 2^20404421179 is an apocalyptic number.

20404421179 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404421179 is an equidigital number, since it uses as much as digits as its factorization.

20404421179 is an evil number, because the sum of its binary digits is even.

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

The spelling of 20404421179 in words is "twenty billion, four hundred four million, four hundred twenty-one thousand, one hundred seventy-nine".