21429601008397 has 2 divisors, whose sum is σ = 21429601008398. Its totient is φ = 21429601008396.

The previous prime is 21429601008371. The next prime is 21429601008427. The reversal of 21429601008397 is 79380010692412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12503960776836 + 8925640231561 = 3536094^2 + 2987581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21429601008397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21429601008307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10714800504198 + 10714800504199.

It is an arithmetic number, because the mean of its divisors is an integer number (10714800504199).

Almost surely, 2^{21429601008397} is an apocalyptic number.

It is an amenable number.

21429601008397 is a deficient number, since it is larger than the sum of its proper divisors (1).

21429601008397 is an equidigital number, since it uses as much as digits as its factorization.

21429601008397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 21429601008397 in words is "twenty-one trillion, four hundred twenty-nine billion, six hundred one million, eight thousand, three hundred ninety-seven".