1012300021 has 2 divisors, whose sum is σ = 1012300022. Its totient is φ = 1012300020.

The previous prime is 1012300019. The next prime is 1012300027. The reversal of 1012300021 is 1200032101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 996980625 + 15319396 = 31575^2 + 3914^2 .

It is an emirp because it is prime and its reverse (1200032101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1012300021 - 2¹ = 1012300019 is a prime.

Together with 1012300019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1012299980 and 1012300007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012300027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506150010 + 506150011.

It is an arithmetic number, because the mean of its divisors is an integer number (506150011).

Almost surely, 2^1012300021 is an apocalyptic number.

It is an amenable number.

1012300021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012300021 is an equidigital number, since it uses as much as digits as its factorization.

1012300021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1012300021 is about 31816.6626313949. The cubic root of 1012300021 is about 1004.0833108780.

Adding to 1012300021 its reverse (1200032101), we get a palindrome (2212332122).

The spelling of 1012300021 in words is "one billion, twelve million, three hundred thousand, twenty-one".