21480675 has 24 divisors (see below), whose sum is σ = 36664320. Its totient is φ = 11085600.

The previous prime is 21480671. The next prime is 21480691. The reversal of 21480675 is 57608412.

It is not a de Polignac number, because 21480675 - 2² = 21480671 is a prime.

It is a super-2 number, since 2×21480675² = 922838796911250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21480671) 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 23 ways as a sum of consecutive naturals, for example, 2295 + ... + 6944.

It is an arithmetic number, because the mean of its divisors is an integer number (1527680).

Almost surely, 2^21480675 is an apocalyptic number.

21480675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21480675 is a deficient number, since it is larger than the sum of its proper divisors (15183645).

21480675 is a wasteful number, since it uses less digits than its factorization.

21480675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9283 (or 9278 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 21480675 is about 4634.7249109305. The cubic root of 21480675 is about 277.9815516630.

It can be divided in two parts, 21480 and 675, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 21480675 in words is "twenty-one million, four hundred eighty thousand, six hundred seventy-five".