212321101 has 2 divisors, whose sum is σ = 212321102. Its totient is φ = 212321100.

The previous prime is 212321099. The next prime is 212321107. The reversal of 212321101 is 101123212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204061225 + 8259876 = 14285^2 + 2874^2 .

It is a cyclic number.

It is not a de Polignac number, because 212321101 - 2¹ = 212321099 is a prime.

Together with 212321099, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212321107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106160550 + 106160551.

It is an arithmetic number, because the mean of its divisors is an integer number (106160551).

Almost surely, 2^212321101 is an apocalyptic number.

It is an amenable number.

212321101 is a deficient number, since it is larger than the sum of its proper divisors (1).

212321101 is an equidigital number, since it uses as much as digits as its factorization.

212321101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 212321101 is about 14571.2422600134. The cubic root of 212321101 is about 596.5740878108.

Adding to 212321101 its reverse (101123212), we get a palindrome (313444313).

The spelling of 212321101 in words is "two hundred twelve million, three hundred twenty-one thousand, one hundred one".