1200055421 has 2 divisors, whose sum is σ = 1200055422. Its totient is φ = 1200055420.

The previous prime is 1200055411. The next prime is 1200055427. The reversal of 1200055421 is 1245500021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 761152921 + 438902500 = 27589^2 + 20950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200055421 - 2⁶ = 1200055357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200055393 and 1200055402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200055427) 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, 600027710 + 600027711.

It is an arithmetic number, because the mean of its divisors is an integer number (600027711).

Almost surely, 2^1200055421 is an apocalyptic number.

It is an amenable number.

1200055421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200055421 is an equidigital number, since it uses as much as digits as its factorization.

1200055421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1200055421 is about 34641.8160753734. The cubic root of 1200055421 is about 1062.6749282643.

Adding to 1200055421 its reverse (1245500021), we get a palindrome (2445555442).

The spelling of 1200055421 in words is "one billion, two hundred million, fifty-five thousand, four hundred twenty-one".