30239975021 has 2 divisors, whose sum is σ = 30239975022. Its totient is φ = 30239975020.

The previous prime is 30239974979. The next prime is 30239975063. The reversal of 30239975021 is 12057993203.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (30239974979) and next prime (30239975063).

It can be written as a sum of positive squares in only one way, i.e., 26154975625 + 4084999396 = 161725^2 + 63914^2 .

It is a cyclic number.

It is not a de Polignac number, because 30239975021 - 2⁶ = 30239974957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30239975021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30239975321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15119987510 + 15119987511.

It is an arithmetic number, because the mean of its divisors is an integer number (15119987511).

Almost surely, 2^30239975021 is an apocalyptic number.

It is an amenable number.

30239975021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30239975021 is an equidigital number, since it uses as much as digits as its factorization.

30239975021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 41.

The spelling of 30239975021 in words is "thirty billion, two hundred thirty-nine million, nine hundred seventy-five thousand, twenty-one".