1204201021 has 4 divisors (see below), whose sum is σ = 1204299100. Its totient is φ = 1204102944.

The previous prime is 1204201007. The next prime is 1204201027. The reversal of 1204201021 is 1201024021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 688275225 + 515925796 = 26235^2 + 22714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1204201021 - 2¹⁷ = 1204069949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1204200992 and 1204201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1204201027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27456 + ... + 56233.

It is an arithmetic number, because the mean of its divisors is an integer number (301074775).

Almost surely, 2^1204201021 is an apocalyptic number.

It is an amenable number.

1204201021 is a deficient number, since it is larger than the sum of its proper divisors (98079).

1204201021 is an equidigital number, since it uses as much as digits as its factorization.

1204201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98078.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1204201021 is about 34701.5996893515. The cubic root of 1204201021 is about 1063.8971946033.

Adding to 1204201021 its reverse (1201024021), we get a palindrome (2405225042).

The spelling of 1204201021 in words is "one billion, two hundred four million, two hundred one thousand, twenty-one".