21398033407 has 2 divisors, whose sum is σ = 21398033408. Its totient is φ = 21398033406.

The previous prime is 21398033381. The next prime is 21398033507. The reversal of 21398033407 is 70433089312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21398033407 - 2²³ = 21389644799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21398033407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21398033507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10699016703 + 10699016704.

It is an arithmetic number, because the mean of its divisors is an integer number (10699016704).

Almost surely, 2^21398033407 is an apocalyptic number.

21398033407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21398033407 is an equidigital number, since it uses as much as digits as its factorization.

21398033407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 21398033407 in words is "twenty-one billion, three hundred ninety-eight million, thirty-three thousand, four hundred seven".