30202030021 has 4 divisors (see below), whose sum is σ = 30251299852. Its totient is φ = 30152760192.

The previous prime is 30202029953. The next prime is 30202030031. The reversal of 30202030021 is 12003020203.

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: 12003020203 = 61 ⋅196770823.

It can be written as a sum of positive squares in 2 ways, for example, as 722856996 + 29479173025 = 26886^2 + 171695^2 .

It is a cyclic number.

It is not a de Polignac number, because 30202030021 - 2²⁷ = 30067812293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30202029983 and 30202030010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30202030031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24633996 + ... + 24635221.

It is an arithmetic number, because the mean of its divisors is an integer number (7562824963).

Almost surely, 2^30202030021 is an apocalyptic number.

It is an amenable number.

30202030021 is a deficient number, since it is larger than the sum of its proper divisors (49269831).

30202030021 is an equidigital number, since it uses as much as digits as its factorization.

30202030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49269830.

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

Adding to 30202030021 its reverse (12003020203), we get a palindrome (42205050224).

The spelling of 30202030021 in words is "thirty billion, two hundred two million, thirty thousand, twenty-one".