40621242220981 has 2 divisors, whose sum is σ = 40621242220982. Its totient is φ = 40621242220980.

The previous prime is 40621242220943. The next prime is 40621242221173. The reversal of 40621242220981 is 18902224212604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34438012928881 + 6183229292100 = 5868391^2 + 2486610^2 .

It is a cyclic number.

It is not a de Polignac number, because 40621242220981 - 2³⁹ = 40071486407093 is a prime.

It is a super-2 number, since 2×40621242220981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40621242220931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20310621110490 + 20310621110491.

It is an arithmetic number, because the mean of its divisors is an integer number (20310621110491).

Almost surely, 2^{40621242220981} is an apocalyptic number.

It is an amenable number.

40621242220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

40621242220981 is an equidigital number, since it uses as much as digits as its factorization.

40621242220981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 40621242220981 in words is "forty trillion, six hundred twenty-one billion, two hundred forty-two million, two hundred twenty thousand, nine hundred eighty-one".