30121131211 has 4 divisors (see below), whose sum is σ = 30165233112. Its totient is φ = 30077029312.

The previous prime is 30121131203. The next prime is 30121131221. The reversal of 30121131211 is 11213112103.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11213112103 = 199 ⋅56347297.

It is a cyclic number.

It is not a de Polignac number, because 30121131211 - 2³ = 30121131203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30121131221) 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, 22049926 + ... + 22051291.

It is an arithmetic number, because the mean of its divisors is an integer number (7541308278).

Almost surely, 2^30121131211 is an apocalyptic number.

30121131211 is a deficient number, since it is larger than the sum of its proper divisors (44101901).

30121131211 is an equidigital number, since it uses as much as digits as its factorization.

30121131211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44101900.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 30121131211 its reverse (11213112103), we get a palindrome (41334243314).

The spelling of 30121131211 in words is "thirty billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred eleven".