40143668407421 has 2 divisors, whose sum is σ = 40143668407422. Its totient is φ = 40143668407420.

The previous prime is 40143668407397. The next prime is 40143668407457. The reversal of 40143668407421 is 12470486634104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20677800871225 + 19465867536196 = 4547285^2 + 4412014^2 .

It is a cyclic number.

It is not a de Polignac number, because 40143668407421 - 2⁶ = 40143668407357 is a prime.

It is a super-2 number, since 2×40143668407421² (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 40143668407421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40143668409421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20071834203710 + 20071834203711.

It is an arithmetic number, because the mean of its divisors is an integer number (20071834203711).

Almost surely, 2^{40143668407421} is an apocalyptic number.

It is an amenable number.

40143668407421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40143668407421 is an equidigital number, since it uses as much as digits as its factorization.

40143668407421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3096576, while the sum is 50.

The spelling of 40143668407421 in words is "forty trillion, one hundred forty-three billion, six hundred sixty-eight million, four hundred seven thousand, four hundred twenty-one".