2455521421 has 2 divisors, whose sum is σ = 2455521422. Its totient is φ = 2455521420.

The previous prime is 2455521401. The next prime is 2455521433. The reversal of 2455521421 is 1241255542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1652422500 + 803098921 = 40650^2 + 28339^2 .

It is a cyclic number.

It is not a de Polignac number, because 2455521421 - 2⁹ = 2455520909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2455521401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1227760710 + 1227760711.

It is an arithmetic number, because the mean of its divisors is an integer number (1227760711).

Almost surely, 2^2455521421 is an apocalyptic number.

It is an amenable number.

2455521421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2455521421 is an equidigital number, since it uses as much as digits as its factorization.

2455521421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16000, while the sum is 31.

The square root of 2455521421 is about 49553.2180690619. The cubic root of 2455521421 is about 1349.1117011336. Note that the first 3 decimals are identical.

Adding to 2455521421 its reverse (1241255542), we get a palindrome (3696776963).

The spelling of 2455521421 in words is "two billion, four hundred fifty-five million, five hundred twenty-one thousand, four hundred twenty-one".