812280421 has 2 divisors, whose sum is σ = 812280422. Its totient is φ = 812280420.

The previous prime is 812280409. The next prime is 812280433. The reversal of 812280421 is 124082218.

It is a balanced prime because it is at equal distance from previous prime (812280409) and next prime (812280433).

It can be written as a sum of positive squares in only one way, i.e., 596043396 + 216237025 = 24414^2 + 14705^2 .

It is a cyclic number.

It is not a de Polignac number, because 812280421 - 2¹³ = 812272229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 812280421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812230421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406140210 + 406140211.

It is an arithmetic number, because the mean of its divisors is an integer number (406140211).

Almost surely, 2^812280421 is an apocalyptic number.

It is an amenable number.

812280421 is a deficient number, since it is larger than the sum of its proper divisors (1).

812280421 is an equidigital number, since it uses as much as digits as its factorization.

812280421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 812280421 is about 28500.5336967573. The cubic root of 812280421 is about 933.0437220341.

The spelling of 812280421 in words is "eight hundred twelve million, two hundred eighty thousand, four hundred twenty-one".