213102405 has 12 divisors (see below), whose sum is σ = 369377580. Its totient is φ = 113654592.

The previous prime is 213102397. The next prime is 213102413. The reversal of 213102405 is 504201312.

It is an interprime number because it is at equal distance from previous prime (213102397) and next prime (213102413).

It can be written as a sum of positive squares in 2 ways, for example, as 28740321 + 184362084 = 5361^2 + 13578^2 .

It is not a de Polignac number, because 213102405 - 2³ = 213102397 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2367760 + ... + 2367849.

It is an arithmetic number, because the mean of its divisors is an integer number (30781465).

Almost surely, 2^213102405 is an apocalyptic number.

It is an amenable number.

213102405 is a deficient number, since it is larger than the sum of its proper divisors (156275175).

213102405 is a wasteful number, since it uses less digits than its factorization.

213102405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4735620 (or 4735617 counting only the distinct ones).

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

The square root of 213102405 is about 14598.0274352393. The cubic root of 213102405 is about 597.3049543397.

Adding to 213102405 its reverse (504201312), we get a palindrome (717303717).

The spelling of 213102405 in words is "two hundred thirteen million, one hundred two thousand, four hundred five".