1021300999 has 2 divisors, whose sum is σ = 1021301000. Its totient is φ = 1021300998.

The previous prime is 1021300997. The next prime is 1021301003. The reversal of 1021300999 is 9990031201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021300999 - 2¹ = 1021300997 is a prime.

Together with 1021300997, 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 (1021300997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510650499 + 510650500.

It is an arithmetic number, because the mean of its divisors is an integer number (510650500).

Almost surely, 2^1021300999 is an apocalyptic number.

1021300999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021300999 is an equidigital number, since it uses as much as digits as its factorization.

1021300999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 1021300999 is about 31957.8002841247. The cubic root of 1021300999 is about 1007.0505065316.

The spelling of 1021300999 in words is "one billion, twenty-one million, three hundred thousand, nine hundred ninety-nine".