30121221212131 has 4 divisors (see below), whose sum is σ = 34424252813872. Its totient is φ = 25818189610392.

The previous prime is 30121221212059. The next prime is 30121221212167. The reversal of 30121221212131 is 13121212212103.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30121221212131 is a prime.

It is a super-2 number, since 2×30121221212131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30121221212171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2151515800860 + ... + 2151515800873.

It is an arithmetic number, because the mean of its divisors is an integer number (8606063203468).

Almost surely, 2^{30121221212131} is an apocalyptic number.

30121221212131 is a deficient number, since it is larger than the sum of its proper divisors (4303031601741).

30121221212131 is an equidigital number, since it uses as much as digits as its factorization.

30121221212131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4303031601740.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 30121221212131 its reverse (13121212212103), we get a palindrome (43242433424234).

The spelling of 30121221212131 in words is "thirty trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, one hundred thirty-one".