30121312100213 has 4 divisors (see below), whose sum is σ = 30121324500300. Its totient is φ = 30121299700128.

The previous prime is 30121312100179. The next prime is 30121312100237. The reversal of 30121312100213 is 31200121312103.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1826976645649 + 28294335454564 = 1351657^2 + 5319242^2 .

It is a cyclic number.

It is not a de Polignac number, because 30121312100213 - 2²⁸ = 30121043664757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30121312100263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1226438 + ... + 7857911.

It is an arithmetic number, because the mean of its divisors is an integer number (7530331125075).

Almost surely, 2^{30121312100213} is an apocalyptic number.

It is an amenable number.

30121312100213 is a deficient number, since it is larger than the sum of its proper divisors (12400087).

30121312100213 is an equidigital number, since it uses as much as digits as its factorization.

30121312100213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12400086.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 30121312100213 its reverse (31200121312103), we get a palindrome (61321433412316).

The spelling of 30121312100213 in words is "thirty trillion, one hundred twenty-one billion, three hundred twelve million, one hundred thousand, two hundred thirteen".