40121621564741 has 2 divisors, whose sum is σ = 40121621564742. Its totient is φ = 40121621564740.

The previous prime is 40121621564711. The next prime is 40121621564747. The reversal of 40121621564741 is 14746512612104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36463119940900 + 3658501623841 = 6038470^2 + 1912721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40121621564741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40121621564692 and 40121621564701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40121621564747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060810782370 + 20060810782371.

It is an arithmetic number, because the mean of its divisors is an integer number (20060810782371).

Almost surely, 2^{40121621564741} is an apocalyptic number.

It is an amenable number.

40121621564741 is a deficient number, since it is larger than the sum of its proper divisors (1).

40121621564741 is an equidigital number, since it uses as much as digits as its factorization.

40121621564741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 40121621564741 in words is "forty trillion, one hundred twenty-one billion, six hundred twenty-one million, five hundred sixty-four thousand, seven hundred forty-one".