5021155421 has 2 divisors, whose sum is σ = 5021155422. Its totient is φ = 5021155420.

The previous prime is 5021155397. The next prime is 5021155457. The reversal of 5021155421 is 1245511205.

5021155421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3893136025 + 1128019396 = 62395^2 + 33586^2 .

It is a cyclic number.

It is not a de Polignac number, because 5021155421 - 2²⁶ = 4954046557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5021155471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2510577710 + 2510577711.

It is an arithmetic number, because the mean of its divisors is an integer number (2510577711).

Almost surely, 2^5021155421 is an apocalyptic number.

It is an amenable number.

5021155421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5021155421 is an equidigital number, since it uses as much as digits as its factorization.

5021155421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 5021155421 is about 70860.1116355316. Note that the first 3 decimals coincide. The cubic root of 5021155421 is about 1712.3842373734.

Adding to 5021155421 its reverse (1245511205), we get a palindrome (6266666626).

The spelling of 5021155421 in words is "five billion, twenty-one million, one hundred fifty-five thousand, four hundred twenty-one".