30000020121 has 6 divisors (see below), whose sum is σ = 43333362410. Its totient is φ = 20000013408.

The previous prime is 30000020119. The next prime is 30000020129. The reversal of 30000020121 is 12102000003.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17902440000 + 12097580121 = 133800^2 + 109989^2 .

It is not a de Polignac number, because 30000020121 - 2¹ = 30000020119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 3333335569 = 30000020121 / (3 + 0 + 0 + 0 + 0 + 0 + 2 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30000020129) 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, 1666667776 + ... + 1666667793.

Almost surely, 2^30000020121 is an apocalyptic number.

It is an amenable number.

30000020121 is a deficient number, since it is larger than the sum of its proper divisors (13333342289).

30000020121 is a wasteful number, since it uses less digits than its factorization.

30000020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333335575 (or 3333335572 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 30000020121 its reverse (12102000003), we get a palindrome (42102020124).

The spelling of 30000020121 in words is "thirty billion, twenty thousand, one hundred twenty-one".