213217641 has 24 divisors (see below), whose sum is σ = 379055040. Its totient is φ = 112466016.

The previous prime is 213217637. The next prime is 213217649. The reversal of 213217641 is 146712312.

213217641 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 17 + 641 = 666.

It is not a de Polignac number, because 213217641 - 2² = 213217637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213217649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129351 + ... + 130988.

It is an arithmetic number, because the mean of its divisors is an integer number (15793960).

Almost surely, 2^213217641 is an apocalyptic number.

213217641 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213217641 is a deficient number, since it is larger than the sum of its proper divisors (165837399).

213217641 is a wasteful number, since it uses less digits than its factorization.

213217641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260365 (or 260362 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 213217641 is about 14601.9738734186. The cubic root of 213217641 is about 597.4125999738.

Adding to 213217641 its reverse (146712312), we get a palindrome (359929953).

The spelling of 213217641 in words is "two hundred thirteen million, two hundred seventeen thousand, six hundred forty-one".