30311200021 has 2 divisors, whose sum is σ = 30311200022. Its totient is φ = 30311200020.

The previous prime is 30311200019. The next prime is 30311200037. The reversal of 30311200021 is 12000211303.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25699296100 + 4611903921 = 160310^2 + 67911^2 .

It is a cyclic number.

It is not a de Polignac number, because 30311200021 - 2¹ = 30311200019 is a prime.

Together with 30311200019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 30311199974 and 30311200010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30311200091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15155600010 + 15155600011.

It is an arithmetic number, because the mean of its divisors is an integer number (15155600011).

Almost surely, 2^30311200021 is an apocalyptic number.

It is an amenable number.

30311200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30311200021 is an equidigital number, since it uses as much as digits as its factorization.

30311200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 30311200021 its reverse (12000211303), we get a palindrome (42311411324).

The spelling of 30311200021 in words is "thirty billion, three hundred eleven million, two hundred thousand, twenty-one".