21271310 has 16 divisors (see below), whose sum is σ = 38917152. Its totient is φ = 8368800.

The previous prime is 21271277. The next prime is 21271319. The reversal of 21271310 is 1317212.

It is a super-2 number, since 2×21271310² = 904937258232200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21271319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16826 + ... + 18045.

It is an arithmetic number, because the mean of its divisors is an integer number (2432322).

Almost surely, 2^21271310 is an apocalyptic number.

21271310 is a deficient number, since it is larger than the sum of its proper divisors (17645842).

21271310 is a wasteful number, since it uses less digits than its factorization.

21271310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34939.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 21271310 is about 4612.0830434848. The cubic root of 21271310 is about 277.0754702324.

Adding to 21271310 its reverse (1317212), we get a palindrome (22588522).

The spelling of 21271310 in words is "twenty-one million, two hundred seventy-one thousand, three hundred ten".