30120673621 has 2 divisors, whose sum is σ = 30120673622. Its totient is φ = 30120673620.

The previous prime is 30120673619. The next prime is 30120673633. The reversal of 30120673621 is 12637602103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16689022596 + 13431651025 = 129186^2 + 115895^2 .

It is a cyclic number.

It is not a de Polignac number, because 30120673621 - 2¹ = 30120673619 is a prime.

Together with 30120673619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30120673021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060336810 + 15060336811.

It is an arithmetic number, because the mean of its divisors is an integer number (15060336811).

Almost surely, 2^30120673621 is an apocalyptic number.

It is an amenable number.

30120673621 is a deficient number, since it is larger than the sum of its proper divisors (1).

30120673621 is an equidigital number, since it uses as much as digits as its factorization.

30120673621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The spelling of 30120673621 in words is "thirty billion, one hundred twenty million, six hundred seventy-three thousand, six hundred twenty-one".