21148460 has 24 divisors (see below), whose sum is σ = 45613680. Its totient is φ = 8230464.

The previous prime is 21148427. The next prime is 21148481. The reversal of 21148460 is 6484112.

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, 13550 + ... + 15029.

It is an arithmetic number, because the mean of its divisors is an integer number (1900570).

Almost surely, 2^21148460 is an apocalyptic number.

21148460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21148460 is an abundant number, since it is smaller than the sum of its proper divisors (24465220).

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

21148460 is a wasteful number, since it uses less digits than its factorization.

21148460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28625 (or 28623 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21148460 is about 4598.7454811068. The cubic root of 21148460 is about 276.5410342325.

The spelling of 21148460 in words is "twenty-one million, one hundred forty-eight thousand, four hundred sixty".