212320002121 has 2 divisors, whose sum is σ = 212320002122. Its totient is φ = 212320002120.

The previous prime is 212320002109. The next prime is 212320002127. The reversal of 212320002121 is 121200023212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196390785600 + 15929216521 = 443160^2 + 126211^2 .

It is a cyclic number.

It is not a de Polignac number, because 212320002121 - 2⁹ = 212320001609 is a prime.

It is a super-2 number, since 2×212320002121² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212320002095 and 212320002104.

It is not a weakly prime, because it can be changed into another prime (212320002127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106160001060 + 106160001061.

It is an arithmetic number, because the mean of its divisors is an integer number (106160001061).

Almost surely, 2^212320002121 is an apocalyptic number.

It is an amenable number.

212320002121 is a deficient number, since it is larger than the sum of its proper divisors (1).

212320002121 is an equidigital number, since it uses as much as digits as its factorization.

212320002121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 212320002121 its reverse (121200023212), we get a palindrome (333520025333).

The spelling of 212320002121 in words is "two hundred twelve billion, three hundred twenty million, two thousand, one hundred twenty-one".