30333131021 has 2 divisors, whose sum is σ = 30333131022. Its totient is φ = 30333131020.

The previous prime is 30333130999. The next prime is 30333131029. The reversal of 30333131021 is 12013133303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29388244900 + 944886121 = 171430^2 + 30739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30333131021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30333130984 and 30333131002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30333131029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15166565510 + 15166565511.

It is an arithmetic number, because the mean of its divisors is an integer number (15166565511).

Almost surely, 2^30333131021 is an apocalyptic number.

It is an amenable number.

30333131021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30333131021 is an equidigital number, since it uses as much as digits as its factorization.

30333131021 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 30333131021 its reverse (12013133303), we get a palindrome (42346264324).

The spelling of 30333131021 in words is "thirty billion, three hundred thirty-three million, one hundred thirty-one thousand, twenty-one".