30121312221 has 48 divisors (see below), whose sum is σ = 58417107840. Its totient is φ = 14443781760.

The previous prime is 30121312217. The next prime is 30121312261. The reversal of 30121312221 is 12221312103.

It is not a de Polignac number, because 30121312221 - 2² = 30121312217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30121312194 and 30121312203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30121312261) 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 47 ways as a sum of consecutive naturals, for example, 1662726 + ... + 1680743.

It is an arithmetic number, because the mean of its divisors is an integer number (1217023080).

Almost surely, 2^30121312221 is an apocalyptic number.

It is an amenable number.

30121312221 is a deficient number, since it is larger than the sum of its proper divisors (28295795619).

30121312221 is a wasteful number, since it uses less digits than its factorization.

30121312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3343506 (or 3343503 counting only the distinct ones).

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

Adding to 30121312221 its reverse (12221312103), we get a palindrome (42342624324).

The spelling of 30121312221 in words is "thirty billion, one hundred twenty-one million, three hundred twelve thousand, two hundred twenty-one".