400044105221 has 4 divisors (see below), whose sum is σ = 400121834112. Its totient is φ = 399966376332.

The previous prime is 400044105203. The next prime is 400044105299. The reversal of 400044105221 is 122501440004.

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 400044105221 - 2¹⁰ = 400044104197 is a prime.

It is a super-2 number, since 2×400044105221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400044105121) 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, 38856725 + ... + 38867018.

It is an arithmetic number, because the mean of its divisors is an integer number (100030458528).

Almost surely, 2^400044105221 is an apocalyptic number.

It is an amenable number.

400044105221 is a deficient number, since it is larger than the sum of its proper divisors (77728891).

400044105221 is an equidigital number, since it uses as much as digits as its factorization.

400044105221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77728890.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 400044105221 its reverse (122501440004), we get a palindrome (522545545225).

The spelling of 400044105221 in words is "four hundred billion, forty-four million, one hundred five thousand, two hundred twenty-one".