5421202421 has 2 divisors, whose sum is σ = 5421202422. Its totient is φ = 5421202420.

The previous prime is 5421202393. The next prime is 5421202429. The reversal of 5421202421 is 1242021245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5056774321 + 364428100 = 71111^2 + 19090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5421202421 is a prime.

It is a super-2 number, since 2×5421202421² = 58778871378912522482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5421202429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2710601210 + 2710601211.

It is an arithmetic number, because the mean of its divisors is an integer number (2710601211).

Almost surely, 2^5421202421 is an apocalyptic number.

It is an amenable number.

5421202421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5421202421 is an equidigital number, since it uses as much as digits as its factorization.

5421202421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 5421202421 is about 73628.8151541229. The cubic root of 5421202421 is about 1756.7038018707.

Adding to 5421202421 its reverse (1242021245), we get a palindrome (6663223666).

The spelling of 5421202421 in words is "five billion, four hundred twenty-one million, two hundred two thousand, four hundred twenty-one".