212310405 has 12 divisors (see below), whose sum is σ = 368004780. Its totient is φ = 113232192.

The previous prime is 212310391. The next prime is 212310409. The reversal of 212310405 is 504013212.

212310405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 146748996 + 65561409 = 12114^2 + 8097^2 .

It is not a de Polignac number, because 212310405 - 2⁷ = 212310277 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212310409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2358960 + ... + 2359049.

It is an arithmetic number, because the mean of its divisors is an integer number (30667065).

Almost surely, 2^212310405 is an apocalyptic number.

It is an amenable number.

212310405 is a deficient number, since it is larger than the sum of its proper divisors (155694375).

212310405 is a wasteful number, since it uses less digits than its factorization.

212310405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4718020 (or 4718017 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 212310405 is about 14570.8752310903. The cubic root of 212310405 is about 596.5640698654.

Adding to 212310405 its reverse (504013212), we get a palindrome (716323617).

The spelling of 212310405 in words is "two hundred twelve million, three hundred ten thousand, four hundred five".