21258868174 has 4 divisors (see below), whose sum is σ = 31888302264. Its totient is φ = 10629434086.

The previous prime is 21258868157. The next prime is 21258868199. The reversal of 21258868174 is 47186885212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5314717042 + ... + 5314717045.

It is an arithmetic number, because the mean of its divisors is an integer number (7972075566).

Almost surely, 2^21258868174 is an apocalyptic number.

21258868174 is a deficient number, since it is larger than the sum of its proper divisors (10629434090).

21258868174 is a wasteful number, since it uses less digits than its factorization.

21258868174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10629434089.

The product of its digits is 1720320, while the sum is 52.

The spelling of 21258868174 in words is "twenty-one billion, two hundred fifty-eight million, eight hundred sixty-eight thousand, one hundred seventy-four".