30311030021 has 4 divisors (see below), whose sum is σ = 30423710700. Its totient is φ = 30198349344.

The previous prime is 30311029981. The next prime is 30311030027. The reversal of 30311030021 is 12003011303.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15859624225 + 14451405796 = 125935^2 + 120214^2 .

It is a cyclic number.

It is not a de Polignac number, because 30311030021 - 2¹⁴ = 30311013637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30311029978 and 30311030005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30311030027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56339936 + ... + 56340473.

It is an arithmetic number, because the mean of its divisors is an integer number (7605927675).

Almost surely, 2^30311030021 is an apocalyptic number.

It is an amenable number.

30311030021 is a deficient number, since it is larger than the sum of its proper divisors (112680679).

30311030021 is a wasteful number, since it uses less digits than its factorization.

30311030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112680678.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 30311030021 its reverse (12003011303), we get a palindrome (42314041324).

The spelling of 30311030021 in words is "thirty billion, three hundred eleven million, thirty thousand, twenty-one".