42351006521 has 2 divisors, whose sum is σ = 42351006522. Its totient is φ = 42351006520.

The previous prime is 42351006419. The next prime is 42351006557. The reversal of 42351006521 is 12560015324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24592512400 + 17758494121 = 156820^2 + 133261^2 .

It is a cyclic number.

It is not a de Polignac number, because 42351006521 - 2²² = 42346812217 is a prime.

It is not a weakly prime, because it can be changed into another prime (42351008521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21175503260 + 21175503261.

It is an arithmetic number, because the mean of its divisors is an integer number (21175503261).

Almost surely, 2^42351006521 is an apocalyptic number.

It is an amenable number.

42351006521 is a deficient number, since it is larger than the sum of its proper divisors (1).

42351006521 is an equidigital number, since it uses as much as digits as its factorization.

42351006521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 42351006521 in words is "forty-two billion, three hundred fifty-one million, six thousand, five hundred twenty-one".