213231004121 has 2 divisors, whose sum is σ = 213231004122. Its totient is φ = 213231004120.

The previous prime is 213231004117. The next prime is 213231004127. The reversal of 213231004121 is 121400132312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136397262400 + 76833741721 = 369320^2 + 277189^2 .

It is a cyclic number.

It is not a de Polignac number, because 213231004121 - 2² = 213231004117 is a prime.

It is a super-2 number, since 2×213231004121² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213231004093 and 213231004102.

It is not a weakly prime, because it can be changed into another prime (213231004127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106615502060 + 106615502061.

It is an arithmetic number, because the mean of its divisors is an integer number (106615502061).

Almost surely, 2^213231004121 is an apocalyptic number.

It is an amenable number.

213231004121 is a deficient number, since it is larger than the sum of its proper divisors (1).

213231004121 is an equidigital number, since it uses as much as digits as its factorization.

213231004121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 213231004121 its reverse (121400132312), we get a palindrome (334631136433).

The spelling of 213231004121 in words is "two hundred thirteen billion, two hundred thirty-one million, four thousand, one hundred twenty-one".