40040121021 has 64 divisors (see below), whose sum is σ = 58477731840. Its totient is φ = 24298306560.

The previous prime is 40040121019. The next prime is 40040121059. The reversal of 40040121021 is 12012104004.

40040121021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40040121021 - 2¹ = 40040121019 is a prime.

It is a super-2 number, since 2×40040121021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40040121091) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 36300556 + ... + 36301658.

It is an arithmetic number, because the mean of its divisors is an integer number (913714560).

Almost surely, 2^40040121021 is an apocalyptic number.

It is an amenable number.

40040121021 is a deficient number, since it is larger than the sum of its proper divisors (18437610819).

40040121021 is a wasteful number, since it uses less digits than its factorization.

40040121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 40040121021 its reverse (12012104004), we get a palindrome (52052225025).

The spelling of 40040121021 in words is "forty billion, forty million, one hundred twenty-one thousand, twenty-one".