30020021231 has 2 divisors, whose sum is σ = 30020021232. Its totient is φ = 30020021230.

The previous prime is 30020021189. The next prime is 30020021287. The reversal of 30020021231 is 13212002003.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30020021231 - 2¹⁰ = 30020020207 is a prime.

It is a super-2 number, since 2×30020021231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30020021531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15010010615 + 15010010616.

It is an arithmetic number, because the mean of its divisors is an integer number (15010010616).

Almost surely, 2^30020021231 is an apocalyptic number.

30020021231 is a deficient number, since it is larger than the sum of its proper divisors (1).

30020021231 is an equidigital number, since it uses as much as digits as its factorization.

30020021231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 30020021231 its reverse (13212002003), we get a palindrome (43232023234).

The spelling of 30020021231 in words is "thirty billion, twenty million, twenty-one thousand, two hundred thirty-one".