400000142444321 has 4 divisors (see below), whose sum is σ = 413793250804500. Its totient is φ = 386207034084144.

The previous prime is 400000142444317. The next prime is 400000142444359. The reversal of 400000142444321 is 123444241000004.

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 210788700622096 + 189211441822225 = 14518564^2 + 13755415^2 .

It is not a de Polignac number, because 400000142444321 - 2² = 400000142444317 is a prime.

It is a super-2 number, since 2×400000142444321² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 13793108360149 = 400000142444321 / (4 + 0 + 0 + 0 + 0 + 0 + 1 + 4 + 2 + 4 + 4 + 4 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400000142444381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6896554180046 + ... + 6896554180103.

It is an arithmetic number, because the mean of its divisors is an integer number (103448312701125).

Almost surely, 2^{400000142444321} is an apocalyptic number.

It is an amenable number.

400000142444321 is a deficient number, since it is larger than the sum of its proper divisors (13793108360179).

400000142444321 is a wasteful number, since it uses less digits than its factorization.

400000142444321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13793108360178.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 400000142444321 its reverse (123444241000004), we get a palindrome (523444383444325).

The spelling of 400000142444321 in words is "four hundred trillion, one hundred forty-two million, four hundred forty-four thousand, three hundred twenty-one".