40555145220421 has 8 divisors (see below), whose sum is σ = 44415022145760. Its totient is φ = 36801018347952.

The previous prime is 40555145220389. The next prime is 40555145220437. The reversal of 40555145220421 is 12402254155504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40555145220421 - 2⁵ = 40555145220389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40555145220221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26437512415 + ... + 26437513948.

It is an arithmetic number, because the mean of its divisors is an integer number (5551877768220).

Almost surely, 2^{40555145220421} is an apocalyptic number.

It is an amenable number.

40555145220421 is a deficient number, since it is larger than the sum of its proper divisors (3859876925339).

40555145220421 is a wasteful number, since it uses less digits than its factorization.

40555145220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52875026435.

The product of its (nonzero) digits is 320000, while the sum is 40.

Adding to 40555145220421 its reverse (12402254155504), we get a palindrome (52957399375925).

The spelling of 40555145220421 in words is "forty trillion, five hundred fifty-five billion, one hundred forty-five million, two hundred twenty thousand, four hundred twenty-one".