30312213110021 has 4 divisors (see below), whose sum is σ = 32095284469452. Its totient is φ = 28529141750592.

The previous prime is 30312213109963. The next prime is 30312213110027. The reversal of 30312213110021 is 12001131221303.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16307778047521 + 14004435062500 = 4038289^2 + 3742250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30312213110021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30312213109975 and 30312213110002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30312213110027) 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 3 ways as a sum of consecutive naturals, for example, 891535679690 + ... + 891535679723.

It is an arithmetic number, because the mean of its divisors is an integer number (8023821117363).

Almost surely, 2^{30312213110021} is an apocalyptic number.

It is an amenable number.

30312213110021 is a deficient number, since it is larger than the sum of its proper divisors (1783071359431).

30312213110021 is a wasteful number, since it uses less digits than its factorization.

30312213110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783071359430.

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

Adding to 30312213110021 its reverse (12001131221303), we get a palindrome (42313344331324).

The spelling of 30312213110021 in words is "thirty trillion, three hundred twelve billion, two hundred thirteen million, one hundred ten thousand, twenty-one".