17421431949 has 24 divisors (see below), whose sum is σ = 27640416960. Its totient is φ = 10524615552.

The previous prime is 17421431933. The next prime is 17421431953. The reversal of 17421431949 is 94913412471.

17421431949 is a `hidden beast` number, since 174 + 2 + 1 + 431 + 9 + 49 = 666.

It is not a de Polignac number, because 17421431949 - 2⁴ = 17421431933 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17421431999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2210844 + ... + 2218709.

It is an arithmetic number, because the mean of its divisors is an integer number (1151684040).

Almost surely, 2^17421431949 is an apocalyptic number.

17421431949 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

17421431949 is a deficient number, since it is larger than the sum of its proper divisors (10218985011).

17421431949 is a wasteful number, since it uses less digits than its factorization.

17421431949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4429601 (or 4429598 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 17421431949 in words is "seventeen billion, four hundred twenty-one million, four hundred thirty-one thousand, nine hundred forty-nine".