21342276 has 72 divisors (see below), whose sum is σ = 58522464. Its totient is φ = 6531840.

The previous prime is 21342257. The next prime is 21342281. The reversal of 21342276 is 67224312.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25911 + ... + 26721.

It is an arithmetic number, because the mean of its divisors is an integer number (812812).

Almost surely, 2^21342276 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21342276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29261232).

21342276 is an abundant number, since it is smaller than the sum of its proper divisors (37180188).

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

21342276 is a wasteful number, since it uses less digits than its factorization.

21342276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881 (or 876 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 21342276 is about 4619.7701241512. The cubic root of 21342276 is about 277.3832574438.

Adding to 21342276 its reverse (67224312), we get a palindrome (88566588).

The spelling of 21342276 in words is "twenty-one million, three hundred forty-two thousand, two hundred seventy-six".