3722800421 has 2 divisors, whose sum is σ = 3722800422. Its totient is φ = 3722800420.

The previous prime is 3722800387. The next prime is 3722800427. The reversal of 3722800421 is 1240082273.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3710515396 + 12285025 = 60914^2 + 3505^2 .

It is an emirp because it is prime and its reverse (1240082273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3722800421 - 2¹⁸ = 3722538277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3722800427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1861400210 + 1861400211.

It is an arithmetic number, because the mean of its divisors is an integer number (1861400211).

Almost surely, 2^3722800421 is an apocalyptic number.

It is an amenable number.

3722800421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3722800421 is an equidigital number, since it uses as much as digits as its factorization.

3722800421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 3722800421 is about 61014.7557644870. The cubic root of 3722800421 is about 1549.8508938774.

Adding to 3722800421 its reverse (1240082273), we get a palindrome (4962882694).

The spelling of 3722800421 in words is "three billion, seven hundred twenty-two million, eight hundred thousand, four hundred twenty-one".