213540212 has 12 divisors (see below), whose sum is σ = 374027556. Its totient is φ = 106675200.

The previous prime is 213540203. The next prime is 213540251. The reversal of 213540212 is 212045312.

It can be written as a sum of positive squares in 2 ways, for example, as 119333776 + 94206436 = 10924^2 + 9706^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18539 + ... + 27762.

It is an arithmetic number, because the mean of its divisors is an integer number (31168963).

Almost surely, 2^213540212 is an apocalyptic number.

It is an amenable number.

213540212 is a deficient number, since it is larger than the sum of its proper divisors (160487344).

213540212 is a wasteful number, since it uses less digits than its factorization.

213540212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47458 (or 47456 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 213540212 is about 14613.0151577284. The cubic root of 213540212 is about 597.7137177732.

Adding to 213540212 its reverse (212045312), we get a palindrome (425585524).

The spelling of 213540212 in words is "two hundred thirteen million, five hundred forty thousand, two hundred twelve".