21871174 has 16 divisors (see below), whose sum is σ = 35445312. Its totient is φ = 10061568.

The previous prime is 21871169. The next prime is 21871207. The reversal of 21871174 is 47117812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7987 + ... + 10369.

It is an arithmetic number, because the mean of its divisors is an integer number (2215332).

Almost surely, 2^21871174 is an apocalyptic number.

21871174 is a deficient number, since it is larger than the sum of its proper divisors (13574138).

21871174 is a wasteful number, since it uses less digits than its factorization.

21871174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2751.

The product of its digits is 3136, while the sum is 31.

The square root of 21871174 is about 4676.6626989767. The cubic root of 21871174 is about 279.6559294120.

Adding to 21871174 its reverse (47117812), we get a palindrome (68988986).

The spelling of 21871174 in words is "twenty-one million, eight hundred seventy-one thousand, one hundred seventy-four".