21484625 has 8 divisors (see below), whose sum is σ = 26812968. Its totient is φ = 17187600.

The previous prime is 21484607. The next prime is 21484669. The reversal of 21484625 is 52648412.

It can be written as a sum of positive squares in 4 ways, for example, as 398161 + 21086464 = 631^2 + 4592^2 .

It is not a de Polignac number, because 21484625 - 2¹⁶ = 21419089 is a prime.

It is a super-2 number, since 2×21484625² = 923178222781250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21484591 and 21484600.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85814 + ... + 86063.

It is an arithmetic number, because the mean of its divisors is an integer number (3351621).

Almost surely, 2^21484625 is an apocalyptic number.

21484625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21484625 is a deficient number, since it is larger than the sum of its proper divisors (5328343).

21484625 is an equidigital number, since it uses as much as digits as its factorization.

21484625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171892 (or 171882 counting only the distinct ones).

The product of its digits is 15360, while the sum is 32.

The square root of 21484625 is about 4635.1510223508. The cubic root of 21484625 is about 277.9985896104.

The spelling of 21484625 in words is "twenty-one million, four hundred eighty-four thousand, six hundred twenty-five".