213820025 has 6 divisors (see below), whose sum is σ = 265136862. Its totient is φ = 171056000.

The previous prime is 213820007. The next prime is 213820039. The reversal of 213820025 is 520028312.

It can be written as a sum of positive squares in 3 ways, for example, as 73136704 + 140683321 = 8552^2 + 11861^2 .

It is not a de Polignac number, because 213820025 - 2¹² = 213815929 is a prime.

It is a Duffinian number.

It is a Curzon 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, 4276376 + ... + 4276425.

It is an arithmetic number, because the mean of its divisors is an integer number (44189477).

Almost surely, 2^213820025 is an apocalyptic number.

213820025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213820025 is a deficient number, since it is larger than the sum of its proper divisors (51316837).

213820025 is an equidigital number, since it uses as much as digits as its factorization.

213820025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8552811 (or 8552806 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 213820025 is about 14622.5861255798. The cubic root of 213820025 is about 597.9746757582.

Adding to 213820025 its reverse (520028312), we get a palindrome (733848337).

The spelling of 213820025 in words is "two hundred thirteen million, eight hundred twenty thousand, twenty-five".