40612568909821 has 4 divisors (see below), whose sum is σ = 40612598458432. Its totient is φ = 40612539361212.

The previous prime is 40612568909813. The next prime is 40612568909839. The reversal of 40612568909821 is 12890986521604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40612568909821 - 2³ = 40612568909813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40612568909821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40612568909021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12606645 + ... + 15496858.

It is an arithmetic number, because the mean of its divisors is an integer number (10153149614608).

Almost surely, 2^{40612568909821} is an apocalyptic number.

It is an amenable number.

40612568909821 is a deficient number, since it is larger than the sum of its proper divisors (29548611).

40612568909821 is a wasteful number, since it uses less digits than its factorization.

40612568909821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29548610.

The product of its (nonzero) digits is 14929920, while the sum is 61.

The spelling of 40612568909821 in words is "forty trillion, six hundred twelve billion, five hundred sixty-eight million, nine hundred nine thousand, eight hundred twenty-one".