1201330021 has 2 divisors, whose sum is σ = 1201330022. Its totient is φ = 1201330020.

The previous prime is 1201330019. The next prime is 1201330037. The reversal of 1201330021 is 1200331021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 768065796 + 433264225 = 27714^2 + 20815^2 .

It is an emirp because it is prime and its reverse (1200331021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201330021 - 2¹ = 1201330019 is a prime.

Together with 1201330019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1201329983 and 1201330010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201330051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600665010 + 600665011.

It is an arithmetic number, because the mean of its divisors is an integer number (600665011).

Almost surely, 2^1201330021 is an apocalyptic number.

It is an amenable number.

1201330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201330021 is an equidigital number, since it uses as much as digits as its factorization.

1201330021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1201330021 is about 34660.2080345747. The cubic root of 1201330021 is about 1063.0510237294.

Adding to 1201330021 its reverse (1200331021), we get a palindrome (2401661042).

The spelling of 1201330021 in words is "one billion, two hundred one million, three hundred thirty thousand, twenty-one".