21272174 has 32 divisors (see below), whose sum is σ = 40608000. Its totient is φ = 8284920.

The previous prime is 21272149. The next prime is 21272177. The reversal of 21272174 is 47127212.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21272177) 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, 6137 + ... + 8955.

It is an arithmetic number, because the mean of its divisors is an integer number (1269000).

Almost surely, 2^21272174 is an apocalyptic number.

21272174 is a deficient number, since it is larger than the sum of its proper divisors (19335826).

21272174 is a wasteful number, since it uses less digits than its factorization.

21272174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2853 (or 2839 counting only the distinct ones).

The product of its digits is 1568, while the sum is 26.

The square root of 21272174 is about 4612.1767095375. The cubic root of 21272174 is about 277.0792216072.

Adding to 21272174 its reverse (47127212), we get a palindrome (68399386).

The spelling of 21272174 in words is "twenty-one million, two hundred seventy-two thousand, one hundred seventy-four".