30121131221989 has 2 divisors, whose sum is σ = 30121131221990. Its totient is φ = 30121131221988.

The previous prime is 30121131221957. The next prime is 30121131222041. The reversal of 30121131221989 is 98912213112103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15750246320964 + 14370884901025 = 3968658^2 + 3790895^2 .

It is a cyclic number.

It is not a de Polignac number, because 30121131221989 - 2⁵ = 30121131221957 is a prime.

It is a super-2 number, since 2×30121131221989² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30121131221789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060565610994 + 15060565610995.

It is an arithmetic number, because the mean of its divisors is an integer number (15060565610995).

Almost surely, 2^{30121131221989} is an apocalyptic number.

It is an amenable number.

30121131221989 is a deficient number, since it is larger than the sum of its proper divisors (1).

30121131221989 is an equidigital number, since it uses as much as digits as its factorization.

30121131221989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 43.

The spelling of 30121131221989 in words is "thirty trillion, one hundred twenty-one billion, one hundred thirty-one million, two hundred twenty-one thousand, nine hundred eighty-nine".