40205201551321 has 4 divisors (see below), whose sum is σ = 40560999795252. Its totient is φ = 39849403307392.

The previous prime is 40205201551301. The next prime is 40205201551343. The reversal of 40205201551321 is 12315510250204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7320298416025 + 32884903135296 = 2705605^2 + 5734536^2 .

It is a cyclic number.

It is not a de Polignac number, because 40205201551321 - 2³⁵ = 40170841812953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40205201551301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177899121796 + ... + 177899122021.

It is an arithmetic number, because the mean of its divisors is an integer number (10140249948813).

Almost surely, 2^{40205201551321} is an apocalyptic number.

It is an amenable number.

40205201551321 is a deficient number, since it is larger than the sum of its proper divisors (355798243931).

40205201551321 is a wasteful number, since it uses less digits than its factorization.

40205201551321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355798243930.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 40205201551321 in words is "forty trillion, two hundred five billion, two hundred one million, five hundred fifty-one thousand, three hundred twenty-one".