20030001221 has 2 divisors, whose sum is σ = 20030001222. Its totient is φ = 20030001220.

The previous prime is 20030001181. The next prime is 20030001253. The reversal of 20030001221 is 12210003002.

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., 19955800225 + 74200996 = 141265^2 + 8614^2 .

It is a cyclic number.

It is not a de Polignac number, because 20030001221 - 2⁶ = 20030001157 is a prime.

It is a super-2 number, since 2×20030001221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20030051221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015000610 + 10015000611.

It is an arithmetic number, because the mean of its divisors is an integer number (10015000611).

Almost surely, 2^20030001221 is an apocalyptic number.

It is an amenable number.

20030001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20030001221 is an equidigital number, since it uses as much as digits as its factorization.

20030001221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20030001221 its reverse (12210003002), we get a palindrome (32240004223).

The spelling of 20030001221 in words is "twenty billion, thirty million, one thousand, two hundred twenty-one".