30121221321 has 24 divisors (see below), whose sum is σ = 44016958440. Its totient is φ = 19846311936.

The previous prime is 30121221301. The next prime is 30121221391. The reversal of 30121221321 is 12312212103.

30121221321 is a `hidden beast` number, since 3 + 0 + 121 + 221 + 321 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1760977296 + 28360244025 = 41964^2 + 168405^2 .

It is not a de Polignac number, because 30121221321 - 2¹⁵ = 30121188553 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30121221294 and 30121221303.

It is not an unprimeable number, because it can be changed into a prime (30121221301) 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, 2121181 + ... + 2135333.

It is an arithmetic number, because the mean of its divisors is an integer number (1834039935).

Almost surely, 2^30121221321 is an apocalyptic number.

It is an amenable number.

30121221321 is a deficient number, since it is larger than the sum of its proper divisors (13895737119).

30121221321 is a wasteful number, since it uses less digits than its factorization.

30121221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16905 (or 16902 counting only the distinct ones).

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

Adding to 30121221321 its reverse (12312212103), we get a palindrome (42433433424).

The spelling of 30121221321 in words is "thirty billion, one hundred twenty-one million, two hundred twenty-one thousand, three hundred twenty-one".