400140533421 has 12 divisors (see below), whose sum is σ = 578635346848. Its totient is φ = 266458243464.

The previous prime is 400140533417. The next prime is 400140533423. The reversal of 400140533421 is 124335041004.

It is a happy number.

It is not a de Polignac number, because 400140533421 - 2² = 400140533417 is a prime.

It is a super-2 number, since 2×400140533421² (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 (400140533423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25167625 + ... + 25183518.

Almost surely, 2^400140533421 is an apocalyptic number.

It is an amenable number.

400140533421 is a deficient number, since it is larger than the sum of its proper divisors (178494813427).

400140533421 is a wasteful number, since it uses less digits than its factorization.

400140533421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50352032 (or 50352029 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 400140533421 its reverse (124335041004), we get a palindrome (524475574425).

The spelling of 400140533421 in words is "four hundred billion, one hundred forty million, five hundred thirty-three thousand, four hundred twenty-one".