21148480 has 28 divisors (see below), whose sum is σ = 50360580. Its totient is φ = 8459264.

The previous prime is 21148427. The next prime is 21148481. The reversal of 21148480 is 8484112.

It can be written as a sum of positive squares in 2 ways, for example, as 6031936 + 15116544 = 2456^2 + 3888^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32725 + ... + 33364.

Almost surely, 2^21148480 is an apocalyptic number.

21148480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21148480 is an abundant number, since it is smaller than the sum of its proper divisors (29212100).

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

21148480 is an equidigital number, since it uses as much as digits as its factorization.

21148480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66106 (or 66096 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 21148480 is about 4598.7476556123. The cubic root of 21148480 is about 276.5411214070.

The spelling of 21148480 in words is "twenty-one million, one hundred forty-eight thousand, four hundred eighty".