1021323099 has 32 divisors (see below), whose sum is σ = 1429943040. Its totient is φ = 647747712.

The previous prime is 1021323097. The next prime is 1021323103. The reversal of 1021323099 is 9903231201.

It is a happy number.

It is not a de Polignac number, because 1021323099 - 2¹ = 1021323097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021323097) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1813792 + ... + 1814354.

It is an arithmetic number, because the mean of its divisors is an integer number (44685720).

Almost surely, 2^1021323099 is an apocalyptic number.

1021323099 is a deficient number, since it is larger than the sum of its proper divisors (408619941).

1021323099 is a wasteful number, since it uses less digits than its factorization.

1021323099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 1021323099 is about 31958.1460507333. The cubic root of 1021323099 is about 1007.0577703568.

The spelling of 1021323099 in words is "one billion, twenty-one million, three hundred twenty-three thousand, ninety-nine".