40012155021 has 16 divisors (see below), whose sum is σ = 54336006720. Its totient is φ = 26182907520.

The previous prime is 40012154977. The next prime is 40012155037. The reversal of 40012155021 is 12055121004.

It is not a de Polignac number, because 40012155021 - 2⁶ = 40012154957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40012155721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54000 + ... + 287993.

It is an arithmetic number, because the mean of its divisors is an integer number (3396000420).

Almost surely, 2^40012155021 is an apocalyptic number.

It is an amenable number.

40012155021 is a deficient number, since it is larger than the sum of its proper divisors (14323851699).

40012155021 is a wasteful number, since it uses less digits than its factorization.

40012155021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342716.

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 40012155021 its reverse (12055121004), we get a palindrome (52067276025).

The spelling of 40012155021 in words is "forty billion, twelve million, one hundred fifty-five thousand, twenty-one".