17874451421 has 4 divisors (see below), whose sum is σ = 17888298144. Its totient is φ = 17860604700.

The previous prime is 17874451409. The next prime is 17874451429. The reversal of 17874451421 is 12415447871.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17874451421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17874451429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6921425 + ... + 6924006.

It is an arithmetic number, because the mean of its divisors is an integer number (4472074536).

Almost surely, 2^17874451421 is an apocalyptic number.

It is an amenable number.

17874451421 is a deficient number, since it is larger than the sum of its proper divisors (13846723).

17874451421 is a wasteful number, since it uses less digits than its factorization.

17874451421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13846722.

The product of its digits is 250880, while the sum is 44.

The spelling of 17874451421 in words is "seventeen billion, eight hundred seventy-four million, four hundred fifty-one thousand, four hundred twenty-one".