213505636 has 12 divisors (see below), whose sum is σ = 374707900. Its totient is φ = 106446240.

The previous prime is 213505613. The next prime is 213505639. The reversal of 213505636 is 636505312.

It can be written as a sum of positive squares in 2 ways, for example, as 189062500 + 24443136 = 13750^2 + 4944^2 .

It is a junction number, because it is equal to n+sod(n) for n = 213505598 and 213505607.

It is not an unprimeable number, because it can be changed into a prime (213505639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75075 + ... + 77866.

Almost surely, 2^213505636 is an apocalyptic number.

It is an amenable number.

213505636 is a deficient number, since it is larger than the sum of its proper divisors (161202264).

213505636 is a wasteful number, since it uses less digits than its factorization.

213505636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153294 (or 153292 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 213505636 is about 14611.8320548794. The cubic root of 213505636 is about 597.6814558324.

The spelling of 213505636 in words is "two hundred thirteen million, five hundred five thousand, six hundred thirty-six".