1021299999 has 4 divisors (see below), whose sum is σ = 1361733336. Its totient is φ = 680866664.

The previous prime is 1021299967. The next prime is 1021300001. The reversal of 1021299999 is 9999921201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021299999 - 2⁵ = 1021299967 is a prime.

1021299999 is a modest number, since divided by 99999 gives 10212 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021299949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170216664 + ... + 170216669.

It is an arithmetic number, because the mean of its divisors is an integer number (340433334).

Almost surely, 2^1021299999 is an apocalyptic number.

1021299999 is a deficient number, since it is larger than the sum of its proper divisors (340433337).

1021299999 is an equidigital number, since it uses as much as digits as its factorization.

1021299999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340433336.

The product of its (nonzero) digits is 236196, while the sum is 51.

The square root of 1021299999 is about 31957.7846384883. The cubic root of 1021299999 is about 1007.0501778492.

The spelling of 1021299999 in words is "one billion, twenty-one million, two hundred ninety-nine thousand, nine hundred ninety-nine".