211320002021 has 2 divisors, whose sum is σ = 211320002022. Its totient is φ = 211320002020.

The previous prime is 211320001987. The next prime is 211320002053. The reversal of 211320002021 is 120200023112.

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., 111012244225 + 100307757796 = 333185^2 + 316714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211320002021 is a prime.

It is a super-2 number, since 2×211320002021² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211320001987 and 211320002005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211320001021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105660001010 + 105660001011.

It is an arithmetic number, because the mean of its divisors is an integer number (105660001011).

Almost surely, 2^211320002021 is an apocalyptic number.

It is an amenable number.

211320002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211320002021 is an equidigital number, since it uses as much as digits as its factorization.

211320002021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 211320002021 its reverse (120200023112), we get a palindrome (331520025133).

The spelling of 211320002021 in words is "two hundred eleven billion, three hundred twenty million, two thousand, twenty-one".