16364244246421 has 2 divisors, whose sum is σ = 16364244246422. Its totient is φ = 16364244246420.

The previous prime is 16364244246323. The next prime is 16364244246439. The reversal of 16364244246421 is 12464244246361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15394440780625 + 969803465796 = 3923575^2 + 984786^2 .

It is a cyclic number.

It is not a de Polignac number, because 16364244246421 - 2³¹ = 16362096762773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16364244246821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8182122123210 + 8182122123211.

It is an arithmetic number, because the mean of its divisors is an integer number (8182122123211).

Almost surely, 2^{16364244246421} is an apocalyptic number.

It is an amenable number.

16364244246421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16364244246421 is an equidigital number, since it uses as much as digits as its factorization.

16364244246421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5308416, while the sum is 49.

The spelling of 16364244246421 in words is "sixteen trillion, three hundred sixty-four billion, two hundred forty-four million, two hundred forty-six thousand, four hundred twenty-one".