5638201421 has 2 divisors, whose sum is σ = 5638201422. Its totient is φ = 5638201420.

The previous prime is 5638201381. The next prime is 5638201561. The reversal of 5638201421 is 1241028365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3802078921 + 1836122500 = 61661^2 + 42850^2 .

It is a cyclic number.

It is not a de Polignac number, because 5638201421 - 2¹⁰ = 5638200397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5638101421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2819100710 + 2819100711.

It is an arithmetic number, because the mean of its divisors is an integer number (2819100711).

Almost surely, 2^5638201421 is an apocalyptic number.

It is an amenable number.

5638201421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5638201421 is an equidigital number, since it uses as much as digits as its factorization.

5638201421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 5638201421 is about 75087.9578960568. The cubic root of 5638201421 is about 1779.8368554974.

Adding to 5638201421 its reverse (1241028365), we get a palindrome (6879229786).

The spelling of 5638201421 in words is "five billion, six hundred thirty-eight million, two hundred one thousand, four hundred twenty-one".