30311122221 has 24 divisors (see below), whose sum is σ = 44238271896. Its totient is φ = 19997366400.

The previous prime is 30311122211. The next prime is 30311122241. The reversal of 30311122221 is 12222111303.

It can be written as a sum of positive squares in 4 ways, for example, as 1746404100 + 28564718121 = 41790^2 + 169011^2 .

It is not a de Polignac number, because 30311122221 - 2¹⁸ = 30310860077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30311122194 and 30311122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30311122211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2113551 + ... + 2127843.

It is an arithmetic number, because the mean of its divisors is an integer number (1843261329).

Almost surely, 2^30311122221 is an apocalyptic number.

It is an amenable number.

30311122221 is a deficient number, since it is larger than the sum of its proper divisors (13927149675).

30311122221 is a wasteful number, since it uses less digits than its factorization.

30311122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16733 (or 16730 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 30311122221 its reverse (12222111303), we get a palindrome (42533233524).

The spelling of 30311122221 in words is "thirty billion, three hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".