213223123021 has 2 divisors, whose sum is σ = 213223123022. Its totient is φ = 213223123020.

The previous prime is 213223123019. The next prime is 213223123031. The reversal of 213223123021 is 120321322312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210580032100 + 2643090921 = 458890^2 + 51411^2 .

It is a cyclic number.

It is not a de Polignac number, because 213223123021 - 2¹ = 213223123019 is a prime.

Together with 213223123019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 213223122983 and 213223123001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213223123031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106611561510 + 106611561511.

It is an arithmetic number, because the mean of its divisors is an integer number (106611561511).

Almost surely, 2^213223123021 is an apocalyptic number.

It is an amenable number.

213223123021 is a deficient number, since it is larger than the sum of its proper divisors (1).

213223123021 is an equidigital number, since it uses as much as digits as its factorization.

213223123021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 213223123021 its reverse (120321322312), we get a palindrome (333544445333).

The spelling of 213223123021 in words is "two hundred thirteen billion, two hundred twenty-three million, one hundred twenty-three thousand, twenty-one".