212402005 has 8 divisors (see below), whose sum is σ = 259691832. Its totient is φ = 166715328.

The previous prime is 212401997. The next prime is 212402009. The reversal of 212402005 is 500204212.

It can be written as a sum of positive squares in 4 ways, for example, as 1542564 + 210859441 = 1242^2 + 14521^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212402005 - 2³ = 212401997 is a prime.

It is a super-2 number, since 2×212402005² = 90229223456040050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212402005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212402009) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 400494 + ... + 401023.

It is an arithmetic number, because the mean of its divisors is an integer number (32461479).

Almost surely, 2^212402005 is an apocalyptic number.

It is an amenable number.

212402005 is a deficient number, since it is larger than the sum of its proper divisors (47289827).

212402005 is an equidigital number, since it uses as much as digits as its factorization.

212402005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801575.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 212402005 is about 14574.0181487468. The cubic root of 212402005 is about 596.6498521455.

Adding to 212402005 its reverse (500204212), we get a palindrome (712606217).

The spelling of 212402005 in words is "two hundred twelve million, four hundred two thousand, five".