213121115 has 8 divisors (see below), whose sum is σ = 261693168. Its totient is φ = 166531680.

The previous prime is 213121093. The next prime is 213121123. The reversal of 213121115 is 511121312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-213121115 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213121093 and 213121102.

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 7 ways as a sum of consecutive naturals, for example, 495416 + ... + 495845.

It is an arithmetic number, because the mean of its divisors is an integer number (32711646).

Almost surely, 2^213121115 is an apocalyptic number.

213121115 is a deficient number, since it is larger than the sum of its proper divisors (48572053).

213121115 is an equidigital number, since it uses as much as digits as its factorization.

213121115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991309.

The product of its digits is 60, while the sum is 17.

The square root of 213121115 is about 14598.6682611805. The cubic root of 213121115 is about 597.3224345876.

Adding to 213121115 its reverse (511121312), we get a palindrome (724242427).

The spelling of 213121115 in words is "two hundred thirteen million, one hundred twenty-one thousand, one hundred fifteen".