30121131973 has 2 divisors, whose sum is σ = 30121131974. Its totient is φ = 30121131972.

The previous prime is 30121131907. The next prime is 30121132001. The reversal of 30121131973 is 37913112103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23919096964 + 6202035009 = 154658^2 + 78753^2 .

It is an emirp because it is prime and its reverse (37913112103) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30121131973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30121131473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060565986 + 15060565987.

It is an arithmetic number, because the mean of its divisors is an integer number (15060565987).

Almost surely, 2^30121131973 is an apocalyptic number.

It is an amenable number.

30121131973 is a deficient number, since it is larger than the sum of its proper divisors (1).

30121131973 is an equidigital number, since it uses as much as digits as its factorization.

30121131973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 31.

The spelling of 30121131973 in words is "thirty billion, one hundred twenty-one million, one hundred thirty-one thousand, nine hundred seventy-three".