213191812 has 24 divisors (see below), whose sum is σ = 382346496. Its totient is φ = 103965888.

The previous prime is 213191777. The next prime is 213191813. The reversal of 213191812 is 218191312.

It is not an unprimeable number, because it can be changed into a prime (213191813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57033 + ... + 60655.

It is an arithmetic number, because the mean of its divisors is an integer number (15931104).

Almost surely, 2^213191812 is an apocalyptic number.

It is an amenable number.

213191812 is a deficient number, since it is larger than the sum of its proper divisors (169154684).

213191812 is a wasteful number, since it uses less digits than its factorization.

213191812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987 (or 3985 counting only the distinct ones).

The product of its digits is 864, while the sum is 28.

The square root of 213191812 is about 14601.0894114104. The cubic root of 213191812 is about 597.3884756517.

The spelling of 213191812 in words is "two hundred thirteen million, one hundred ninety-one thousand, eight hundred twelve".