21467825 has 6 divisors (see below), whose sum is σ = 26620134. Its totient is φ = 17174240.

The previous prime is 21467813. The next prime is 21467833. The reversal of 21467825 is 52876412.

It can be written as a sum of positive squares in 3 ways, for example, as 3136 + 21464689 = 56^2 + 4633^2 .

It is not a de Polignac number, because 21467825 - 2¹⁶ = 21402289 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 429332 + ... + 429381.

It is an arithmetic number, because the mean of its divisors is an integer number (4436689).

Almost surely, 2^21467825 is an apocalyptic number.

21467825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21467825 is a deficient number, since it is larger than the sum of its proper divisors (5152309).

21467825 is an equidigital number, since it uses as much as digits as its factorization.

21467825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858723 (or 858718 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 21467825 is about 4633.3384292538. The cubic root of 21467825 is about 277.9261099623.

The spelling of 21467825 in words is "twenty-one million, four hundred sixty-seven thousand, eight hundred twenty-five".