1021021099 has 8 divisors (see below), whose sum is σ = 1167245568. Its totient is φ = 874887720.

The previous prime is 1021021093. The next prime is 1021021103. The reversal of 1021021099 is 9901201201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1021021099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021021093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3234 + ... + 45304.

It is an arithmetic number, because the mean of its divisors is an integer number (145905696).

Almost surely, 2^1021021099 is an apocalyptic number.

1021021099 is a deficient number, since it is larger than the sum of its proper divisors (146224469).

1021021099 is an equidigital number, since it uses as much as digits as its factorization.

1021021099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45545.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 1021021099 is about 31953.4207714917. The cubic root of 1021021099 is about 1006.9584999664.

It can be divided in two parts, 102 and 1021099, that added together give a palindrome (1021201).

The spelling of 1021021099 in words is "one billion, twenty-one million, twenty-one thousand, ninety-nine".