21480025 has 12 divisors (see below), whose sum is σ = 30440512. Its totient is φ = 14729040.

The previous prime is 21480007. The next prime is 21480049. The reversal of 21480025 is 52008412.

It is not a de Polignac number, because 21480025 - 2¹¹ = 21477977 is a prime.

It is a super-2 number, since 2×21480025² = 922782948001250, 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 = 21479978 and 21480005.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61197 + ... + 61546.

Almost surely, 2^21480025 is an apocalyptic number.

21480025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21480025 is a deficient number, since it is larger than the sum of its proper divisors (8960487).

21480025 is a wasteful number, since it uses less digits than its factorization.

21480025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122760 (or 122755 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 21480025 is about 4634.6547875759. The cubic root of 21480025 is about 277.9787477500.

Adding to 21480025 its reverse (52008412), we get a palindrome (73488437).

The spelling of 21480025 in words is "twenty-one million, four hundred eighty thousand, twenty-five".