21317262 has 32 divisors (see below), whose sum is σ = 44578080. Its totient is φ = 6787200.

The previous prime is 21317249. The next prime is 21317267. The reversal of 21317262 is 26271312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21317267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16968 + ... + 18180.

It is an arithmetic number, because the mean of its divisors is an integer number (1393065).

Almost surely, 2^21317262 is an apocalyptic number.

21317262 is an abundant number, since it is smaller than the sum of its proper divisors (23260818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21317262 is a wasteful number, since it uses less digits than its factorization.

21317262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348.

The product of its digits is 1008, while the sum is 24.

The square root of 21317262 is about 4617.0620528644. The cubic root of 21317262 is about 277.2748469930.

Adding to 21317262 its reverse (26271312), we get a palindrome (47588574).

The spelling of 21317262 in words is "twenty-one million, three hundred seventeen thousand, two hundred sixty-two".