213533660 has 24 divisors (see below), whose sum is σ = 460541760. Its totient is φ = 83104704.

The previous prime is 213533629. The next prime is 213533669. The reversal of 213533660 is 66335312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213533669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143540 + ... + 145019.

It is an arithmetic number, because the mean of its divisors is an integer number (19189240).

Almost surely, 2^213533660 is an apocalyptic number.

213533660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213533660 is an abundant number, since it is smaller than the sum of its proper divisors (247008100).

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

213533660 is a wasteful number, since it uses less digits than its factorization.

213533660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288605 (or 288603 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 29.

The square root of 213533660 is about 14612.7909722955. The cubic root of 213533660 is about 597.7076045447.

Adding to 213533660 its reverse (66335312), we get a palindrome (279868972).

The spelling of 213533660 in words is "two hundred thirteen million, five hundred thirty-three thousand, six hundred sixty".