213100025 has 12 divisors (see below), whose sum is σ = 265932012. Its totient is φ = 169391040.

The previous prime is 213100009. The next prime is 213100061. The reversal of 213100025 is 520001312.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3892729 + 209207296 = 1973^2 + 14464^2 .

It is not a de Polignac number, because 213100025 - 2⁴ = 213100009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213099982 and 213100009.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23222 + ... + 31071.

It is an arithmetic number, because the mean of its divisors is an integer number (22161001).

Almost surely, 2^213100025 is an apocalyptic number.

213100025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213100025 is a deficient number, since it is larger than the sum of its proper divisors (52831987).

213100025 is a wasteful number, since it uses less digits than its factorization.

213100025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54460 (or 54455 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 213100025 is about 14597.9459171488. The cubic root of 213100025 is about 597.3027306966.

Adding to 213100025 its reverse (520001312), we get a palindrome (733101337).

The spelling of 213100025 in words is "two hundred thirteen million, one hundred thousand, twenty-five".