40621235633621 has 2 divisors, whose sum is σ = 40621235633622. Its totient is φ = 40621235633620.

The previous prime is 40621235633611. The next prime is 40621235633639. The reversal of 40621235633621 is 12633653212604.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31185679723396 + 9435555910225 = 5584414^2 + 3071735^2 .

It is a cyclic number.

It is not a de Polignac number, because 40621235633621 - 2⁴² = 36223189122517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40621235633611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20310617816810 + 20310617816811.

It is an arithmetic number, because the mean of its divisors is an integer number (20310617816811).

Almost surely, 2^{40621235633621} is an apocalyptic number.

It is an amenable number.

40621235633621 is a deficient number, since it is larger than the sum of its proper divisors (1).

40621235633621 is an equidigital number, since it uses as much as digits as its factorization.

40621235633621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 44.

The spelling of 40621235633621 in words is "forty trillion, six hundred twenty-one billion, two hundred thirty-five million, six hundred thirty-three thousand, six hundred twenty-one".