30223121221 has 2 divisors, whose sum is σ = 30223121222. Its totient is φ = 30223121220.

The previous prime is 30223121209. The next prime is 30223121231. The reversal of 30223121221 is 12212132203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29699352225 + 523768996 = 172335^2 + 22886^2 .

It is a cyclic number.

It is not a de Polignac number, because 30223121221 - 2²¹ = 30221024069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30223121231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15111560610 + 15111560611.

It is an arithmetic number, because the mean of its divisors is an integer number (15111560611).

Almost surely, 2^30223121221 is an apocalyptic number.

It is an amenable number.

30223121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30223121221 is an equidigital number, since it uses as much as digits as its factorization.

30223121221 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 19.

Adding to 30223121221 its reverse (12212132203), we get a palindrome (42435253424).

The spelling of 30223121221 in words is "thirty billion, two hundred twenty-three million, one hundred twenty-one thousand, two hundred twenty-one".