213020321121 has 16 divisors (see below), whose sum is σ = 315666964800. Its totient is φ = 141976960704.

The previous prime is 213020321117. The next prime is 213020321177. The reversal of 213020321121 is 121123020312.

213020321121 is a `hidden beast` number, since 21 + 302 + 0 + 321 + 1 + 21 = 666.

It is not a de Polignac number, because 213020321121 - 2² = 213020321117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213020321094 and 213020321103.

It is not an unprimeable number, because it can be changed into a prime (213020321021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 909351 + ... + 1119356.

It is an arithmetic number, because the mean of its divisors is an integer number (19729185300).

Almost surely, 2^213020321121 is an apocalyptic number.

It is an amenable number.

213020321121 is a deficient number, since it is larger than the sum of its proper divisors (102646643679).

213020321121 is a wasteful number, since it uses less digits than its factorization.

213020321121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032605 (or 2032599 counting only the distinct ones).

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

Adding to 213020321121 its reverse (121123020312), we get a palindrome (334143341433).

The spelling of 213020321121 in words is "two hundred thirteen billion, twenty million, three hundred twenty-one thousand, one hundred twenty-one".