21435403049 has 2 divisors, whose sum is σ = 21435403050. Its totient is φ = 21435403048.

The previous prime is 21435403039. The next prime is 21435403079. The reversal of 21435403049 is 94030453412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21179563024 + 255840025 = 145532^2 + 15995^2 .

It is a cyclic number.

It is not a de Polignac number, because 21435403049 - 2¹⁶ = 21435337513 is a prime.

It is not a weakly prime, because it can be changed into another prime (21435403039) 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, 10717701524 + 10717701525.

It is an arithmetic number, because the mean of its divisors is an integer number (10717701525).

Almost surely, 2^21435403049 is an apocalyptic number.

It is an amenable number.

21435403049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21435403049 is an equidigital number, since it uses as much as digits as its factorization.

21435403049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 21435403049 in words is "twenty-one billion, four hundred thirty-five million, four hundred three thousand, forty-nine".