213123660 has 48 divisors (see below), whose sum is σ = 597408000. Its totient is φ = 56769984.

The previous prime is 213123643. The next prime is 213123787. The reversal of 213123660 is 66321312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 213123660.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82671 + ... + 85209.

It is an arithmetic number, because the mean of its divisors is an integer number (12446000).

Almost surely, 2^213123660 is an apocalyptic number.

213123660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213123660 is an abundant number, since it is smaller than the sum of its proper divisors (384284340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213123660 is a wasteful number, since it uses less digits than its factorization.

213123660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3950 (or 3948 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 213123660 is about 14598.7554264054. The cubic root of 213123660 is about 597.3248122334.

Adding to 213123660 its reverse (66321312), we get a palindrome (279444972).

The spelling of 213123660 in words is "two hundred thirteen million, one hundred twenty-three thousand, six hundred sixty".