1321021113 has 16 divisors (see below), whose sum is σ = 1858072320. Its totient is φ = 832525776.

The previous prime is 1321021069. The next prime is 1321021129. The reversal of 1321021113 is 3111201231.

It is a happy number.

It is not a de Polignac number, because 1321021113 - 2¹² = 1321017017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321021092 and 1321021101.

It is not an unprimeable number, because it can be changed into a prime (1321021133) 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 15 ways as a sum of consecutive naturals, for example, 1806 + ... + 51432.

It is an arithmetic number, because the mean of its divisors is an integer number (116129520).

Almost surely, 2^1321021113 is an apocalyptic number.

It is an amenable number.

1321021113 is a deficient number, since it is larger than the sum of its proper divisors (537051207).

1321021113 is a wasteful number, since it uses less digits than its factorization.

1321021113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50116.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1321021113 is about 36345.8541377142. The cubic root of 1321021113 is about 1097.2440965339.

Adding to 1321021113 its reverse (3111201231), we get a palindrome (4432222344).

The spelling of 1321021113 in words is "one billion, three hundred twenty-one million, twenty-one thousand, one hundred thirteen".