213621164 has 12 divisors (see below), whose sum is σ = 380890944. Its totient is φ = 104795184.

The previous prime is 213621139. The next prime is 213621169. The reversal of 213621164 is 461126312.

It is not an unprimeable number, because it can be changed into a prime (213621169) 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, 503612 + ... + 504035.

It is an arithmetic number, because the mean of its divisors is an integer number (31740912).

Almost surely, 2^213621164 is an apocalyptic number.

It is an amenable number.

213621164 is a deficient number, since it is larger than the sum of its proper divisors (167269780).

213621164 is a wasteful number, since it uses less digits than its factorization.

213621164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007704 (or 1007702 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 213621164 is about 14615.7847548464. The cubic root of 213621164 is about 597.7892382999.

Adding to 213621164 its reverse (461126312), we get a palindrome (674747476).

The spelling of 213621164 in words is "two hundred thirteen million, six hundred twenty-one thousand, one hundred sixty-four".