63210021221 has 2 divisors, whose sum is σ = 63210021222. Its totient is φ = 63210021220.

The previous prime is 63210021181. The next prime is 63210021223. The reversal of 63210021221 is 12212001236.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44316144196 + 18893877025 = 210514^2 + 137455^2 .

It is a cyclic number.

It is not a de Polignac number, because 63210021221 - 2⁶ = 63210021157 is a prime.

Together with 63210021223, 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 = 63210021193 and 63210021202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63210021223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31605010610 + 31605010611.

It is an arithmetic number, because the mean of its divisors is an integer number (31605010611).

Almost surely, 2^63210021221 is an apocalyptic number.

It is an amenable number.

63210021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

63210021221 is an equidigital number, since it uses as much as digits as its factorization.

63210021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 63210021221 its reverse (12212001236), we get a palindrome (75422022457).

The spelling of 63210021221 in words is "sixty-three billion, two hundred ten million, twenty-one thousand, two hundred twenty-one".