1320100121 has 4 divisors (see below), whose sum is σ = 1326940212. Its totient is φ = 1313260032.

The previous prime is 1320100057. The next prime is 1320100127. The reversal of 1320100121 is 1210010231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1210010231 = 19 ⋅63684749.

It can be written as a sum of positive squares in 2 ways, for example, as 520341721 + 799758400 = 22811^2 + 28280^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320100121 - 2⁶ = 1320100057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1320100127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3419756 + ... + 3420141.

It is an arithmetic number, because the mean of its divisors is an integer number (331735053).

Almost surely, 2^1320100121 is an apocalyptic number.

It is an amenable number.

1320100121 is a deficient number, since it is larger than the sum of its proper divisors (6840091).

1320100121 is an equidigital number, since it uses as much as digits as its factorization.

1320100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840090.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1320100121 is about 36333.1820929574. The cubic root of 1320100121 is about 1096.9890443468.

Adding to 1320100121 its reverse (1210010231), we get a palindrome (2530110352).

The spelling of 1320100121 in words is "one billion, three hundred twenty million, one hundred thousand, one hundred twenty-one".