1234321021 has 2 divisors, whose sum is σ = 1234321022. Its totient is φ = 1234321020.

The previous prime is 1234320991. The next prime is 1234321027. The reversal of 1234321021 is 1201234321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 778968100 + 455352921 = 27910^2 + 21339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1234321021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1234321021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1234321027) 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 as a sum of consecutive naturals, namely, 617160510 + 617160511.

It is an arithmetic number, because the mean of its divisors is an integer number (617160511).

Almost surely, 2^1234321021 is an apocalyptic number.

It is an amenable number.

1234321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1234321021 is an equidigital number, since it uses as much as digits as its factorization.

1234321021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1234321021 is about 35132.9051033358. The cubic root of 1234321021 is about 1072.6944700543.

Adding to 1234321021 its reverse (1201234321), we get a palindrome (2435555342).

The spelling of 1234321021 in words is "one billion, two hundred thirty-four million, three hundred twenty-one thousand, twenty-one".