30121103201221 has 2 divisors, whose sum is σ = 30121103201222. Its totient is φ = 30121103201220.

The previous prime is 30121103201201. The next prime is 30121103201327. The reversal of 30121103201221 is 12210230112103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19806638716225 + 10314464484996 = 4450465^2 + 3211614^2 .

It is a cyclic number.

It is not a de Polignac number, because 30121103201221 - 2⁹ = 30121103200709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30121103201201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060551600610 + 15060551600611.

It is an arithmetic number, because the mean of its divisors is an integer number (15060551600611).

Almost surely, 2^{30121103201221} is an apocalyptic number.

It is an amenable number.

30121103201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30121103201221 is an equidigital number, since it uses as much as digits as its factorization.

30121103201221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 30121103201221 its reverse (12210230112103), we get a palindrome (42331333313324).

The spelling of 30121103201221 in words is "thirty trillion, one hundred twenty-one billion, one hundred three million, two hundred one thousand, two hundred twenty-one".