40124012321 has 4 divisors (see below), whose sum is σ = 40126432944. Its totient is φ = 40121591700.

The previous prime is 40124012317. The next prime is 40124012329. The reversal of 40124012321 is 12321042104.

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 40124012321 - 2² = 40124012317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40124012293 and 40124012302.

It is not an unprimeable number, because it can be changed into a prime (40124012329) 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, 1185275 + ... + 1218656.

It is an arithmetic number, because the mean of its divisors is an integer number (10031608236).

Almost surely, 2^40124012321 is an apocalyptic number.

It is an amenable number.

40124012321 is a deficient number, since it is larger than the sum of its proper divisors (2420623).

40124012321 is a wasteful number, since it uses less digits than its factorization.

40124012321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420622.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 40124012321 its reverse (12321042104), we get a palindrome (52445054425).

The spelling of 40124012321 in words is "forty billion, one hundred twenty-four million, twelve thousand, three hundred twenty-one".