21139174 has 8 divisors (see below), whose sum is σ = 36238608. Its totient is φ = 9059640.

The previous prime is 21139163. The next prime is 21139189. The reversal of 21139174 is 47193112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754957 + ... + 754984.

It is an arithmetic number, because the mean of its divisors is an integer number (4529826).

Almost surely, 2^21139174 is an apocalyptic number.

21139174 is a deficient number, since it is larger than the sum of its proper divisors (15099434).

21139174 is a wasteful number, since it uses less digits than its factorization.

21139174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509950.

The product of its digits is 1512, while the sum is 28.

The square root of 21139174 is about 4597.7357470825. The cubic root of 21139174 is about 276.5005531764.

The spelling of 21139174 in words is "twenty-one million, one hundred thirty-nine thousand, one hundred seventy-four".