21480276 has 48 divisors (see below), whose sum is σ = 52093440. Its totient is φ = 6883200.

The previous prime is 21480257. The next prime is 21480293. The reversal of 21480276 is 67208412.

It is a super-2 number, since 2×21480276² = 922804514072352, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44605 + ... + 45083.

It is an arithmetic number, because the mean of its divisors is an integer number (1085280).

Almost surely, 2^21480276 is an apocalyptic number.

It is an amenable number.

21480276 is an abundant number, since it is smaller than the sum of its proper divisors (30613164).

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

21480276 is a wasteful number, since it uses less digits than its factorization.

21480276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 21480276 is about 4634.6818661047. The cubic root of 21480276 is about 277.9798304985.

Adding to 21480276 its reverse (67208412), we get a palindrome (88688688).

The spelling of 21480276 in words is "twenty-one million, four hundred eighty thousand, two hundred seventy-six".