213620665 has 16 divisors (see below), whose sum is σ = 267890688. Its totient is φ = 163221696.

The previous prime is 213620663. The next prime is 213620677. The reversal of 213620665 is 566026312.

It is a cyclic number.

It is not a de Polignac number, because 213620665 - 2¹ = 213620663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213620663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127624 + ... + 129286.

It is an arithmetic number, because the mean of its divisors is an integer number (16743168).

Almost surely, 2^213620665 is an apocalyptic number.

It is an amenable number.

213620665 is a deficient number, since it is larger than the sum of its proper divisors (54270023).

213620665 is a wasteful number, since it uses less digits than its factorization.

213620665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 213620665 is about 14615.7676842511. The cubic root of 213620665 is about 597.7887728387.

Adding to 213620665 its reverse (566026312), we get a palindrome (779646977).

It can be divided in two parts, 2136 and 20665, that added together give a square (22801 = 151²).

The spelling of 213620665 in words is "two hundred thirteen million, six hundred twenty thousand, six hundred sixty-five".