213101133222121 has 2 divisors, whose sum is σ = 213101133222122. Its totient is φ = 213101133222120.

The previous prime is 213101133222119. The next prime is 213101133222157. The reversal of 213101133222121 is 121222331101312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208846979468521 + 4254153753600 = 14451539^2 + 2062560^2 .

It is a cyclic number.

It is not a de Polignac number, because 213101133222121 - 2¹ = 213101133222119 is a prime.

Together with 213101133222119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (213101133222191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106550566611060 + 106550566611061.

It is an arithmetic number, because the mean of its divisors is an integer number (106550566611061).

Almost surely, 2^{213101133222121} is an apocalyptic number.

It is an amenable number.

213101133222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

213101133222121 is an equidigital number, since it uses as much as digits as its factorization.

213101133222121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 213101133222121 its reverse (121222331101312), we get a palindrome (334323464323433).

The spelling of 213101133222121 in words is "two hundred thirteen trillion, one hundred one billion, one hundred thirty-three million, two hundred twenty-two thousand, one hundred twenty-one".