400061504421 has 6 divisors (see below), whose sum is σ = 577866617510. Its totient is φ = 266707669608.

The previous prime is 400061504417. The next prime is 400061504449. The reversal of 400061504421 is 124405160004.

400061504421 is a `hidden beast` number, since 4 + 0 + 0 + 0 + 615 + 0 + 4 + 42 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 245506376196 + 154555128225 = 495486^2 + 393135^2 .

It is not a de Polignac number, because 400061504421 - 2² = 400061504417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400061504461) 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 5 ways as a sum of consecutive naturals, for example, 22225639126 + ... + 22225639143.

Almost surely, 2^400061504421 is an apocalyptic number.

It is an amenable number.

400061504421 is a deficient number, since it is larger than the sum of its proper divisors (177805113089).

400061504421 is a wasteful number, since it uses less digits than its factorization.

400061504421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44451278275 (or 44451278272 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 400061504421 its reverse (124405160004), we get a palindrome (524466664425).

The spelling of 400061504421 in words is "four hundred billion, sixty-one million, five hundred four thousand, four hundred twenty-one".