20416322155421 has 2 divisors, whose sum is σ = 20416322155422. Its totient is φ = 20416322155420.

The previous prime is 20416322155399. The next prime is 20416322155451. The reversal of 20416322155421 is 12455122361402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19968073159225 + 448248996196 = 4468565^2 + 669514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20416322155421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20416322155451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10208161077710 + 10208161077711.

It is an arithmetic number, because the mean of its divisors is an integer number (10208161077711).

Almost surely, 2^{20416322155421} is an apocalyptic number.

It is an amenable number.

20416322155421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20416322155421 is an equidigital number, since it uses as much as digits as its factorization.

20416322155421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 20416322155421 in words is "twenty trillion, four hundred sixteen billion, three hundred twenty-two million, one hundred fifty-five thousand, four hundred twenty-one".