213320121 has 16 divisors (see below), whose sum is σ = 326461824. Its totient is φ = 121371264.

The previous prime is 213320113. The next prime is 213320179. The reversal of 213320121 is 121023312.

213320121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213320121 - 2³ = 213320113 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 213320121.

It is not an unprimeable number, because it can be changed into a prime (213320321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16906 + ... + 26691.

It is an arithmetic number, because the mean of its divisors is an integer number (20403864).

Almost surely, 2^213320121 is an apocalyptic number.

213320121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213320121 is a deficient number, since it is larger than the sum of its proper divisors (113141703).

213320121 is a wasteful number, since it uses less digits than its factorization.

213320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43840.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 213320121 is about 14605.4825664885. The cubic root of 213320121 is about 597.5082972419.

Adding to 213320121 its reverse (121023312), we get a palindrome (334343433).

The spelling of 213320121 in words is "two hundred thirteen million, three hundred twenty thousand, one hundred twenty-one".