40144721321 has 4 divisors (see below), whose sum is σ = 40155309012. Its totient is φ = 40134133632.

The previous prime is 40144721293. The next prime is 40144721347. The reversal of 40144721321 is 12312744104.

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 4116505600 + 36028215721 = 64160^2 + 189811^2 .

It is a cyclic number.

It is not a de Polignac number, because 40144721321 - 2¹⁸ = 40144459177 is a prime.

It is a super-2 number, since 2×40144721321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40144721021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5288156 + ... + 5295741.

It is an arithmetic number, because the mean of its divisors is an integer number (10038827253).

Almost surely, 2^40144721321 is an apocalyptic number.

It is an amenable number.

40144721321 is a deficient number, since it is larger than the sum of its proper divisors (10587691).

40144721321 is a wasteful number, since it uses less digits than its factorization.

40144721321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10587690.

The product of its (nonzero) digits is 5376, while the sum is 29.

The spelling of 40144721321 in words is "forty billion, one hundred forty-four million, seven hundred twenty-one thousand, three hundred twenty-one".