21276516 has 24 divisors (see below), whose sum is σ = 49845600. Its totient is φ = 7063552.

The previous prime is 21276491. The next prime is 21276547. The reversal of 21276516 is 61567212.

21276516 = 150² + 151² + ... + 406².

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 366 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (2076900).

Almost surely, 2^21276516 is an apocalyptic number.

It is an amenable number.

21276516 is an abundant number, since it is smaller than the sum of its proper divisors (28569084).

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

21276516 is a wasteful number, since it uses less digits than its factorization.

21276516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7163 (or 7161 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 21276516 is about 4612.6473960189. The cubic root of 21276516 is about 277.0980724642.

The spelling of 21276516 in words is "twenty-one million, two hundred seventy-six thousand, five hundred sixteen".