40851437001421 has 2 divisors, whose sum is σ = 40851437001422. Its totient is φ = 40851437001420.

The previous prime is 40851437001379. The next prime is 40851437001449. The reversal of 40851437001421 is 12410073415804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36965062412100 + 3886374589321 = 6079890^2 + 1971389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40851437001421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40851437001121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20425718500710 + 20425718500711.

It is an arithmetic number, because the mean of its divisors is an integer number (20425718500711).

Almost surely, 2^{40851437001421} is an apocalyptic number.

It is an amenable number.

40851437001421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40851437001421 is an equidigital number, since it uses as much as digits as its factorization.

40851437001421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 40851437001421 in words is "forty trillion, eight hundred fifty-one billion, four hundred thirty-seven million, one thousand, four hundred twenty-one".