213121260 has 96 divisors (see below), whose sum is σ = 723340800. Its totient is φ = 51664320.

The previous prime is 213121241. The next prime is 213121273. The reversal of 213121260 is 62121312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12000 + ... + 23879.

It is an arithmetic number, because the mean of its divisors is an integer number (7534800).

Almost surely, 2^213121260 is an apocalyptic number.

213121260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213121260 is an abundant number, since it is smaller than the sum of its proper divisors (510219540).

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

213121260 is a wasteful number, since it uses less digits than its factorization.

213121260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35908 (or 35900 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 213121260 is about 14598.6732273861. The cubic root of 213121260 is about 597.3225700532.

Adding to 213121260 its reverse (62121312), we get a palindrome (275242572).

The spelling of 213121260 in words is "two hundred thirteen million, one hundred twenty-one thousand, two hundred sixty".