40024404320021 has 4 divisors (see below), whose sum is σ = 43662986530944. Its totient is φ = 36385822109100.

The previous prime is 40024404319981. The next prime is 40024404320059. The reversal of 40024404320021 is 12002340442004.

It is a happy number.

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 40024404320021 - 2¹⁸ = 40024404057877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40024404320821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1819291105445 + ... + 1819291105466.

It is an arithmetic number, because the mean of its divisors is an integer number (10915746632736).

Almost surely, 2^{40024404320021} is an apocalyptic number.

It is an amenable number.

40024404320021 is a deficient number, since it is larger than the sum of its proper divisors (3638582210923).

40024404320021 is a wasteful number, since it uses less digits than its factorization.

40024404320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638582210922.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 40024404320021 its reverse (12002340442004), we get a palindrome (52026744762025).

The spelling of 40024404320021 in words is "forty trillion, twenty-four billion, four hundred four million, three hundred twenty thousand, twenty-one".