40128902766221 has 2 divisors, whose sum is σ = 40128902766222. Its totient is φ = 40128902766220.

The previous prime is 40128902766191. The next prime is 40128902766259. The reversal of 40128902766221 is 12266720982104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38192226960196 + 1936675806025 = 6179986^2 + 1391645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40128902766221 is a prime.

It is a super-2 number, since 2×40128902766221² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40128902766221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40128902763221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20064451383110 + 20064451383111.

It is an arithmetic number, because the mean of its divisors is an integer number (20064451383111).

Almost surely, 2^{40128902766221} is an apocalyptic number.

It is an amenable number.

40128902766221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40128902766221 is an equidigital number, since it uses as much as digits as its factorization.

40128902766221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 40128902766221 in words is "forty trillion, one hundred twenty-eight billion, nine hundred two million, seven hundred sixty-six thousand, two hundred twenty-one".