1021323121 has 12 divisors (see below), whose sum is σ = 1279460532. Its totient is φ = 808079328.

The previous prime is 1021323109. The next prime is 1021323157. The reversal of 1021323121 is 1213231201.

1021323121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 117418896 + 903904225 = 10836^2 + 30065^2 .

It is not a de Polignac number, because 1021323121 - 2¹¹ = 1021321073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021323095 and 1021323104.

It is not an unprimeable number, because it can be changed into a prime (1021324121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 801030 + ... + 802303.

It is an arithmetic number, because the mean of its divisors is an integer number (106621711).

Almost surely, 2^1021323121 is an apocalyptic number.

It is an amenable number.

1021323121 is a deficient number, since it is larger than the sum of its proper divisors (258137411).

1021323121 is a wasteful number, since it uses less digits than its factorization.

1021323121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603360 (or 1603353 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1021323121 is about 31958.1463949335. The cubic root of 1021323121 is about 1007.0577775877.

Adding to 1021323121 its reverse (1213231201), we get a palindrome (2234554322).

The spelling of 1021323121 in words is "one billion, twenty-one million, three hundred twenty-three thousand, one hundred twenty-one".