812038421 has 2 divisors, whose sum is σ = 812038422. Its totient is φ = 812038420.

The previous prime is 812038373. The next prime is 812038427. The reversal of 812038421 is 124830218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 760987396 + 51051025 = 27586^2 + 7145^2 .

It is a cyclic number.

It is not a de Polignac number, because 812038421 - 2¹⁰ = 812037397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812038427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406019210 + 406019211.

It is an arithmetic number, because the mean of its divisors is an integer number (406019211).

Almost surely, 2^812038421 is an apocalyptic number.

It is an amenable number.

812038421 is a deficient number, since it is larger than the sum of its proper divisors (1).

812038421 is an equidigital number, since it uses as much as digits as its factorization.

812038421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 812038421 is about 28496.2878459634. The cubic root of 812038421 is about 932.9510532947.

Adding to 812038421 its reverse (124830218), we get a palindrome (936868639).

The spelling of 812038421 in words is "eight hundred twelve million, thirty-eight thousand, four hundred twenty-one".