20210003221 has 2 divisors, whose sum is σ = 20210003222. Its totient is φ = 20210003220.

The previous prime is 20210003183. The next prime is 20210003251. The reversal of 20210003221 is 12230001202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19316830225 + 893172996 = 138985^2 + 29886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210003221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210003251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105001610 + 10105001611.

It is an arithmetic number, because the mean of its divisors is an integer number (10105001611).

Almost surely, 2^20210003221 is an apocalyptic number.

It is an amenable number.

20210003221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210003221 is an equidigital number, since it uses as much as digits as its factorization.

20210003221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20210003221 its reverse (12230001202), we get a palindrome (32440004423).

The spelling of 20210003221 in words is "twenty billion, two hundred ten million, three thousand, two hundred twenty-one".