1012021999 has 2 divisors, whose sum is σ = 1012022000. Its totient is φ = 1012021998.

The previous prime is 1012021991. The next prime is 1012022017. The reversal of 1012021999 is 9991202101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1012021999 - 2³ = 1012021991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012021991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506010999 + 506011000.

It is an arithmetic number, because the mean of its divisors is an integer number (506011000).

Almost surely, 2^1012021999 is an apocalyptic number.

1012021999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012021999 is an equidigital number, since it uses as much as digits as its factorization.

1012021999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 1012021999 is about 31812.2932056147. The cubic root of 1012021999 is about 1003.9913806845.

The spelling of 1012021999 in words is "one billion, twelve million, twenty-one thousand, nine hundred ninety-nine".