40421656221 has 4 divisors (see below), whose sum is σ = 53895541632. Its totient is φ = 26947770812.

The previous prime is 40421656201. The next prime is 40421656237. The reversal of 40421656221 is 12265612404.

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 40421656221 - 2⁹ = 40421655709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40421656201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6736942701 + ... + 6736942706.

It is an arithmetic number, because the mean of its divisors is an integer number (13473885408).

Almost surely, 2^40421656221 is an apocalyptic number.

It is an amenable number.

40421656221 is a deficient number, since it is larger than the sum of its proper divisors (13473885411).

40421656221 is a wasteful number, since it uses less digits than its factorization.

40421656221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13473885410.

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 40421656221 in words is "forty billion, four hundred twenty-one million, six hundred fifty-six thousand, two hundred twenty-one".