1321001121 has 16 divisors (see below), whose sum is σ = 1973389248. Its totient is φ = 778968000.

The previous prime is 1321001093. The next prime is 1321001131. The reversal of 1321001121 is 1211001231.

It is not a de Polignac number, because 1321001121 - 2¹³ = 1320992929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321001097 and 1321001106.

It is not an unprimeable number, because it can be changed into a prime (1321001131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 539730 + ... + 542171.

It is an arithmetic number, because the mean of its divisors is an integer number (123336828).

Almost surely, 2^1321001121 is an apocalyptic number.

1321001121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321001121 is a deficient number, since it is larger than the sum of its proper divisors (652388127).

1321001121 is a wasteful number, since it uses less digits than its factorization.

1321001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081952.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1321001121 is about 36345.5791121836. The cubic root of 1321001121 is about 1097.2385613676.

Adding to 1321001121 its reverse (1211001231), we get a palindrome (2532002352).

The spelling of 1321001121 in words is "one billion, three hundred twenty-one million, one thousand, one hundred twenty-one".