20351851421393 has 2 divisors, whose sum is σ = 20351851421394. Its totient is φ = 20351851421392.

The previous prime is 20351851421381. The next prime is 20351851421449. The reversal of 20351851421393 is 39312415815302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16659393254464 + 3692458166929 = 4081592^2 + 1921577^2 .

It is a cyclic number.

It is not a de Polignac number, because 20351851421393 - 2¹⁴ = 20351851405009 is a prime.

It is not a weakly prime, because it can be changed into another prime (20351851421303) 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, 10175925710696 + 10175925710697.

It is an arithmetic number, because the mean of its divisors is an integer number (10175925710697).

Almost surely, 2^{20351851421393} is an apocalyptic number.

It is an amenable number.

20351851421393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20351851421393 is an equidigital number, since it uses as much as digits as its factorization.

20351851421393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 20351851421393 in words is "twenty trillion, three hundred fifty-one billion, eight hundred fifty-one million, four hundred twenty-one thousand, three hundred ninety-three".