17421685949 has 16 divisors (see below), whose sum is σ = 18221869440. Its totient is φ = 16639940160.

The previous prime is 17421685937. The next prime is 17421685993. The reversal of 17421685949 is 94958612471.

It is a cyclic number.

It is not a de Polignac number, because 17421685949 - 2¹² = 17421681853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17421685894 and 17421685903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17421685909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1173032 + ... + 1187790.

It is an arithmetic number, because the mean of its divisors is an integer number (1138866840).

Almost surely, 2^17421685949 is an apocalyptic number.

It is an amenable number.

17421685949 is a deficient number, since it is larger than the sum of its proper divisors (800183491).

17421685949 is a wasteful number, since it uses less digits than its factorization.

17421685949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15380.

The product of its digits is 4354560, while the sum is 56.

The spelling of 17421685949 in words is "seventeen billion, four hundred twenty-one million, six hundred eighty-five thousand, nine hundred forty-nine".