30123311021 has 2 divisors, whose sum is σ = 30123311022. Its totient is φ = 30123311020.

The previous prime is 30123311003. The next prime is 30123311051. The reversal of 30123311021 is 12011332103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23958705796 + 6164605225 = 154786^2 + 78515^2 .

It is a cyclic number.

It is not a de Polignac number, because 30123311021 - 2¹⁸ = 30123048877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30123311051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15061655510 + 15061655511.

It is an arithmetic number, because the mean of its divisors is an integer number (15061655511).

Almost surely, 2^30123311021 is an apocalyptic number.

It is an amenable number.

30123311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30123311021 is an equidigital number, since it uses as much as digits as its factorization.

30123311021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 30123311021 its reverse (12011332103), we get a palindrome (42134643124).

The spelling of 30123311021 in words is "thirty billion, one hundred twenty-three million, three hundred eleven thousand, twenty-one".