40213563828721 has 2 divisors, whose sum is σ = 40213563828722. Its totient is φ = 40213563828720.

The previous prime is 40213563828703. The next prime is 40213563828797. The reversal of 40213563828721 is 12782836531204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38993343136225 + 1220220692496 = 6244465^2 + 1104636^2 .

It is a cyclic number.

It is not a de Polignac number, because 40213563828721 - 2¹⁷ = 40213563697649 is a prime.

It is not a weakly prime, because it can be changed into another prime (40213563820721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20106781914360 + 20106781914361.

It is an arithmetic number, because the mean of its divisors is an integer number (20106781914361).

Almost surely, 2^{40213563828721} is an apocalyptic number.

It is an amenable number.

40213563828721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40213563828721 is an equidigital number, since it uses as much as digits as its factorization.

40213563828721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3870720, while the sum is 52.

The spelling of 40213563828721 in words is "forty trillion, two hundred thirteen billion, five hundred sixty-three million, eight hundred twenty-eight thousand, seven hundred twenty-one".