21480625 has 10 divisors (see below), whose sum is σ = 26842970. Its totient is φ = 17184000.

The previous prime is 21480611. The next prime is 21480637. The reversal of 21480625 is 52608412.

It can be written as a sum of positive squares in 5 ways, for example, as 2505889 + 18974736 = 1583^2 + 4356^2 .

It is not a de Polignac number, because 21480625 - 2⁵ = 21480593 is a prime.

It is a super-2 number, since 2×21480625² = 922834500781250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21480593 and 21480602.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16560 + ... + 17809.

It is an arithmetic number, because the mean of its divisors is an integer number (2684297).

Almost surely, 2^21480625 is an apocalyptic number.

21480625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21480625 is a deficient number, since it is larger than the sum of its proper divisors (5362345).

21480625 is an frugal number, since it uses more digits than its factorization.

21480625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34389 (or 34374 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21480625 is about 4634.7195168640. The cubic root of 21480625 is about 277.9813359794.

The spelling of 21480625 in words is "twenty-one million, four hundred eighty thousand, six hundred twenty-five".