1320202121 has 4 divisors (see below), whose sum is σ = 1508802432. Its totient is φ = 1131601812.

The previous prime is 1320202073. The next prime is 1320202141. The reversal of 1320202121 is 1212020231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1320202121 - 2⁶ = 1320202057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320202096 and 1320202105.

It is not an unprimeable number, because it can be changed into a prime (1320202141) 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, 94300145 + ... + 94300158.

It is an arithmetic number, because the mean of its divisors is an integer number (377200608).

Almost surely, 2^1320202121 is an apocalyptic number.

It is an amenable number.

1320202121 is a deficient number, since it is larger than the sum of its proper divisors (188600311).

1320202121 is an equidigital number, since it uses as much as digits as its factorization.

1320202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188600310.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1320202121 is about 36334.5857414117. The cubic root of 1320202121 is about 1097.0172972545.

Adding to 1320202121 its reverse (1212020231), we get a palindrome (2532222352).

The spelling of 1320202121 in words is "one billion, three hundred twenty million, two hundred two thousand, one hundred twenty-one".