30120121 has 6 divisors (see below), whose sum is σ = 30343866. Its totient is φ = 29898000.

The previous prime is 30120113. The next prime is 30120131. The reversal of 30120121 is 12102103.

It can be written as a sum of positive squares in only one way, i.e., 29550096 + 570025 = 5436^2 + 755^2 .

It is not a de Polignac number, because 30120121 - 2³ = 30120113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30120098 and 30120107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30120131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22141 + ... + 23461.

It is an arithmetic number, because the mean of its divisors is an integer number (5057311).

Almost surely, 2^30120121 is an apocalyptic number.

It is an amenable number.

30120121 is a deficient number, since it is larger than the sum of its proper divisors (223745).

30120121 is an equidigital number, since it uses as much as digits as its factorization.

30120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623 (or 1472 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 30120121 is about 5488.1801173066. The cubic root of 30120121 is about 311.1374137295.

Adding to 30120121 its reverse (12102103), we get a palindrome (42222224).

The spelling of 30120121 in words is "thirty million, one hundred twenty thousand, one hundred twenty-one".