821534425441 has 2 divisors, whose sum is σ = 821534425442. Its totient is φ = 821534425440.

The previous prime is 821534425363. The next prime is 821534425493. The reversal of 821534425441 is 144524435128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815280779041 + 6253646400 = 902929^2 + 79080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821534425441 is a prime.

It is not a weakly prime, because it can be changed into another prime (821534425141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410767212720 + 410767212721.

It is an arithmetic number, because the mean of its divisors is an integer number (410767212721).

Almost surely, 2^821534425441 is an apocalyptic number.

It is an amenable number.

821534425441 is a deficient number, since it is larger than the sum of its proper divisors (1).

821534425441 is an equidigital number, since it uses as much as digits as its factorization.

821534425441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 614400, while the sum is 43.

The spelling of 821534425441 in words is "eight hundred twenty-one billion, five hundred thirty-four million, four hundred twenty-five thousand, four hundred forty-one".