30320200021 has 4 divisors (see below), whose sum is σ = 30322089100. Its totient is φ = 30318310944.

The previous prime is 30320200003. The next prime is 30320200069. The reversal of 30320200021 is 12000202303.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12000202303 = 1973 ⋅6082211.

It can be written as a sum of positive squares in 2 ways, for example, as 22181634225 + 8138565796 = 148935^2 + 90214^2 .

It is a cyclic number.

It is not a de Polignac number, because 30320200021 - 2⁵ = 30320199989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30320199974 and 30320200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30320240021) 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, 920256 + ... + 952633.

It is an arithmetic number, because the mean of its divisors is an integer number (7580522275).

Almost surely, 2^30320200021 is an apocalyptic number.

It is an amenable number.

30320200021 is a deficient number, since it is larger than the sum of its proper divisors (1889079).

30320200021 is a wasteful number, since it uses less digits than its factorization.

30320200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889078.

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 30320200021 its reverse (12000202303), we get a palindrome (42320402324).

The spelling of 30320200021 in words is "thirty billion, three hundred twenty million, two hundred thousand, twenty-one".