212440412025 has 72 divisors (see below), whose sum is σ = 404617819320. Its totient is φ = 106178641920.

The previous prime is 212440412017. The next prime is 212440412069. The reversal of 212440412025 is 520214044212.

It is a happy number.

212440412025 is a `hidden beast` number, since 2 + 1 + 244 + 0 + 412 + 0 + 2 + 5 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 7100927289 + 205339484736 = 84267^2 + 453144^2 .

It is not a de Polignac number, because 212440412025 - 2³ = 212440412017 is a prime.

It is a super-2 number, since 2×212440412025² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212440412025.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 772041 + ... + 1010409.

It is an arithmetic number, because the mean of its divisors is an integer number (5619691935).

Almost surely, 2^212440412025 is an apocalyptic number.

212440412025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

212440412025 is a deficient number, since it is larger than the sum of its proper divisors (192177407295).

212440412025 is a wasteful number, since it uses less digits than its factorization.

212440412025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238635 (or 238627 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

Adding to 212440412025 its reverse (520214044212), we get a palindrome (732654456237).

The spelling of 212440412025 in words is "two hundred twelve billion, four hundred forty million, four hundred twelve thousand, twenty-five".