30313331021 has 2 divisors, whose sum is σ = 30313331022. Its totient is φ = 30313331020.

The previous prime is 30313330979. The next prime is 30313331053. The reversal of 30313331021 is 12013331303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20481616996 + 9831714025 = 143114^2 + 99155^2 .

It is a cyclic number.

It is not a de Polignac number, because 30313331021 - 2¹⁰ = 30313329997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30313330984 and 30313331002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30313334021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15156665510 + 15156665511.

It is an arithmetic number, because the mean of its divisors is an integer number (15156665511).

Almost surely, 2^30313331021 is an apocalyptic number.

It is an amenable number.

30313331021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30313331021 is an equidigital number, since it uses as much as digits as its factorization.

30313331021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 30313331021 its reverse (12013331303), we get a palindrome (42326662324).

The spelling of 30313331021 in words is "thirty billion, three hundred thirteen million, three hundred thirty-one thousand, twenty-one".