21435403079 has 2 divisors, whose sum is σ = 21435403080. Its totient is φ = 21435403078.

The previous prime is 21435403049. The next prime is 21435403163. The reversal of 21435403079 is 97030453412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21435403079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21435403039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717701539 + 10717701540.

It is an arithmetic number, because the mean of its divisors is an integer number (10717701540).

Almost surely, 2^21435403079 is an apocalyptic number.

21435403079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21435403079 is an equidigital number, since it uses as much as digits as its factorization.

21435403079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 21435403079 in words is "twenty-one billion, four hundred thirty-five million, four hundred three thousand, seventy-nine".