1321120005 has 32 divisors (see below), whose sum is σ = 2172718080. Its totient is φ = 685217280.

The previous prime is 1321120001. The next prime is 1321120013. The reversal of 1321120005 is 5000211231.

1321120005 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1321120005 - 2² = 1321120001 is a prime.

It is a super-2 number, since 2×1321120005² = 3490716135222400050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321120001) 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, 73324 + ... + 89546.

It is an arithmetic number, because the mean of its divisors is an integer number (67897440).

Almost surely, 2^1321120005 is an apocalyptic number.

1321120005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321120005 is a deficient number, since it is larger than the sum of its proper divisors (851598075).

1321120005 is a wasteful number, since it uses less digits than its factorization.

1321120005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16381.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1321120005 is about 36347.2145425203. The cubic root of 1321120005 is about 1097.2714758480.

Adding to 1321120005 its reverse (5000211231), we get a palindrome (6321331236).

The spelling of 1321120005 in words is "one billion, three hundred twenty-one million, one hundred twenty thousand, five".