21410025 has 48 divisors (see below), whose sum is σ = 43580544. Its totient is φ = 9031680.

The previous prime is 21410023. The next prime is 21410029. The reversal of 21410025 is 52001412.

It is not a de Polignac number, because 21410025 - 2¹ = 21410023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21409986 and 21410013.

It is not an unprimeable number, because it can be changed into a prime (21410023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5257 + ... + 8393.

It is an arithmetic number, because the mean of its divisors is an integer number (907928).

Almost surely, 2^21410025 is an apocalyptic number.

21410025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21410025 is an abundant number, since it is smaller than the sum of its proper divisors (22170519).

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

21410025 is a wasteful number, since it uses less digits than its factorization.

21410025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170 (or 3165 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21410025 is about 4627.0968219824. The cubic root of 21410025 is about 277.6764562319.

Adding to 21410025 its reverse (52001412), we get a palindrome (73411437).

The spelling of 21410025 in words is "twenty-one million, four hundred ten thousand, twenty-five".