21276630 has 24 divisors (see below), whose sum is σ = 55319472. Its totient is φ = 5673744.

The previous prime is 21276623. The next prime is 21276631. The reversal of 21276630 is 3667212.

It is a happy number.

21276630 is a `hidden beast` number, since 2 + 1 + 27 + 6 + 630 = 666.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 21276594 and 21276603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21276631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118114 + ... + 118293.

It is an arithmetic number, because the mean of its divisors is an integer number (2304978).

Almost surely, 2^21276630 is an apocalyptic number.

21276630 is an abundant number, since it is smaller than the sum of its proper divisors (34042842).

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

21276630 is a wasteful number, since it uses less digits than its factorization.

21276630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236420 (or 236417 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 21276630 is about 4612.6597533310. The cubic root of 21276630 is about 277.0985673624.

The spelling of 21276630 in words is "twenty-one million, two hundred seventy-six thousand, six hundred thirty".