21170480 has 20 divisors (see below), whose sum is σ = 49221552. Its totient is φ = 8468160.

The previous prime is 21170453. The next prime is 21170507. The reversal of 21170480 is 8407112.

It is an interprime number because it is at equal distance from previous prime (21170453) and next prime (21170507).

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132236 + ... + 132395.

Almost surely, 2^21170480 is an apocalyptic number.

21170480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21170480 is an abundant number, since it is smaller than the sum of its proper divisors (28051072).

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

21170480 is a wasteful number, since it uses less digits than its factorization.

21170480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264644 (or 264638 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 21170480 is about 4601.1389894242. The cubic root of 21170480 is about 276.6369800892.

Adding to 21170480 its reverse (8407112), we get a palindrome (29577592).

The spelling of 21170480 in words is "twenty-one million, one hundred seventy thousand, four hundred eighty".