1920418296421 has 2 divisors, whose sum is σ = 1920418296422. Its totient is φ = 1920418296420.

The previous prime is 1920418296389. The next prime is 1920418296449. The reversal of 1920418296421 is 1246928140291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1480967302500 + 439450993921 = 1216950^2 + 662911^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920418296421 - 2⁵ = 1920418296389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920418216421) 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, 960209148210 + 960209148211.

It is an arithmetic number, because the mean of its divisors is an integer number (960209148211).

Almost surely, 2^{1920418296421} is an apocalyptic number.

It is an amenable number.

1920418296421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920418296421 is an equidigital number, since it uses as much as digits as its factorization.

1920418296421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 1920418296421 in words is "one trillion, nine hundred twenty billion, four hundred eighteen million, two hundred ninety-six thousand, four hundred twenty-one".