40138726221 has 48 divisors (see below), whose sum is σ = 64570364352. Its totient is φ = 23820076800.

The previous prime is 40138726217. The next prime is 40138726223. The reversal of 40138726221 is 12262783104.

It is a happy number.

40138726221 is a `hidden beast` number, since 401 + 3 + 8 + 7 + 26 + 221 = 666.

40138726221 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 40138726221 - 2² = 40138726217 is a prime.

It is a super-2 number, since 2×40138726221² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40138726223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2726346 + ... + 2741028.

It is an arithmetic number, because the mean of its divisors is an integer number (1345215924).

Almost surely, 2^40138726221 is an apocalyptic number.

It is an amenable number.

40138726221 is a deficient number, since it is larger than the sum of its proper divisors (24431638131).

40138726221 is a wasteful number, since it uses less digits than its factorization.

40138726221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15274 (or 15271 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 40138726221 in words is "forty billion, one hundred thirty-eight million, seven hundred twenty-six thousand, two hundred twenty-one".