42263426643421 has 2 divisors, whose sum is σ = 42263426643422. Its totient is φ = 42263426643420.

The previous prime is 42263426643397. The next prime is 42263426643491. The reversal of 42263426643421 is 12434662436224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34567873508025 + 7695553135396 = 5879445^2 + 2774086^2 .

It is a cyclic number.

It is not a de Polignac number, because 42263426643421 - 2³⁹ = 41713670829533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42263426643491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21131713321710 + 21131713321711.

It is an arithmetic number, because the mean of its divisors is an integer number (21131713321711).

Almost surely, 2^{42263426643421} is an apocalyptic number.

It is an amenable number.

42263426643421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42263426643421 is an equidigital number, since it uses as much as digits as its factorization.

42263426643421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7962624, while the sum is 49.

The spelling of 42263426643421 in words is "forty-two trillion, two hundred sixty-three billion, four hundred twenty-six million, six hundred forty-three thousand, four hundred twenty-one".