40423333421 has 4 divisors (see below), whose sum is σ = 41817241500. Its totient is φ = 39029425344.

The previous prime is 40423333409. The next prime is 40423333427. The reversal of 40423333421 is 12433332404.

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 29700730921 + 10722602500 = 172339^2 + 103550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40423333421 is a prime.

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: 1393908049 = 40423333421 / (4 + 0 + 4 + 2 + 3 + 3 + 3 + 3 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40423333427) 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, 696953996 + ... + 696954053.

It is an arithmetic number, because the mean of its divisors is an integer number (10454310375).

Almost surely, 2^40423333421 is an apocalyptic number.

It is an amenable number.

40423333421 is a deficient number, since it is larger than the sum of its proper divisors (1393908079).

40423333421 is a wasteful number, since it uses less digits than its factorization.

40423333421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393908078.

The product of its (nonzero) digits is 20736, while the sum is 29.

Adding to 40423333421 its reverse (12433332404), we get a palindrome (52856665825).

The spelling of 40423333421 in words is "forty billion, four hundred twenty-three million, three hundred thirty-three thousand, four hundred twenty-one".