20212200221 has 2 divisors, whose sum is σ = 20212200222. Its totient is φ = 20212200220.

The previous prime is 20212200163. The next prime is 20212200223. The reversal of 20212200221 is 12200221202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20185305625 + 26894596 = 142075^2 + 5186^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212200221 - 2²⁶ = 20145091357 is a prime.

Together with 20212200223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20212200196 and 20212200205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212200223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106100110 + 10106100111.

It is an arithmetic number, because the mean of its divisors is an integer number (10106100111).

Almost surely, 2^20212200221 is an apocalyptic number.

It is an amenable number.

20212200221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212200221 is an equidigital number, since it uses as much as digits as its factorization.

20212200221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20212200221 its reverse (12200221202), we get a palindrome (32412421423).

It can be divided in two parts, 202 and 12200221, that multiplied together give a palindrome (2464444642).

The spelling of 20212200221 in words is "twenty billion, two hundred twelve million, two hundred thousand, two hundred twenty-one".