5421224021 has 2 divisors, whose sum is σ = 5421224022. Its totient is φ = 5421224020.

The previous prime is 5421223987. The next prime is 5421224023. The reversal of 5421224021 is 1204221245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4442222500 + 979001521 = 66650^2 + 31289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5421224021 is a prime.

Together with 5421224023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5421224023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2710612010 + 2710612011.

It is an arithmetic number, because the mean of its divisors is an integer number (2710612011).

Almost surely, 2^5421224021 is an apocalyptic number.

It is an amenable number.

5421224021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5421224021 is an equidigital number, since it uses as much as digits as its factorization.

5421224021 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 5421224021 is about 73628.9618356799. The cubic root of 5421224021 is about 1756.7061349787.

Adding to 5421224021 its reverse (1204221245), we get a palindrome (6625445266).

The spelling of 5421224021 in words is "five billion, four hundred twenty-one million, two hundred twenty-four thousand, twenty-one".