213404121 has 24 divisors (see below), whose sum is σ = 358263360. Its totient is φ = 119876256.

The previous prime is 213404101. The next prime is 213404131. The reversal of 213404121 is 121404312.

213404121 is a `hidden beast` number, since 213 + 40 + 412 + 1 = 666.

213404121 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 213404121 - 2⁵ = 213404089 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213404094 and 213404103.

It is not an unprimeable number, because it can be changed into a prime (213404101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24990 + ... + 32423.

It is an arithmetic number, because the mean of its divisors is an integer number (14927640).

Almost surely, 2^213404121 is an apocalyptic number.

213404121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213404121 is a deficient number, since it is larger than the sum of its proper divisors (144859239).

213404121 is a wasteful number, since it uses less digits than its factorization.

213404121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57485 (or 57482 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 213404121 is about 14608.3579159329. The cubic root of 213404121 is about 597.5867147711.

Adding to 213404121 its reverse (121404312), we get a palindrome (334808433).

The spelling of 213404121 in words is "two hundred thirteen million, four hundred four thousand, one hundred twenty-one".