1320020101 has 4 divisors (see below), whose sum is σ = 1322174092. Its totient is φ = 1317866112.

The previous prime is 1320020077. The next prime is 1320020161. The reversal of 1320020101 is 1010200231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1010200231 = 17 ⋅59423543.

It can be written as a sum of positive squares in 2 ways, for example, as 77457601 + 1242562500 = 8801^2 + 35250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320020101 - 2²⁵ = 1286465669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320020161) 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, 1076076 + ... + 1077301.

It is an arithmetic number, because the mean of its divisors is an integer number (330543523).

Almost surely, 2^1320020101 is an apocalyptic number.

It is an amenable number.

1320020101 is a deficient number, since it is larger than the sum of its proper divisors (2153991).

1320020101 is an equidigital number, since it uses as much as digits as its factorization.

1320020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153990.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1320020101 is about 36332.0808790248. The cubic root of 1320020101 is about 1096.9668786450.

Adding to 1320020101 its reverse (1010200231), we get a palindrome (2330220332).

The spelling of 1320020101 in words is "one billion, three hundred twenty million, twenty thousand, one hundred one".