40110021 has 36 divisors (see below), whose sum is σ = 70369312. Its totient is φ = 21561984.

The previous prime is 40110017. The next prime is 40110041. The reversal of 40110021 is 12001104.

It is a happy number.

It is not a de Polignac number, because 40110021 - 2² = 40110017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40109985 and 40110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40110041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17106 + ... + 19308.

Almost surely, 2^40110021 is an apocalyptic number.

It is an amenable number.

40110021 is a deficient number, since it is larger than the sum of its proper divisors (30259291).

40110021 is a wasteful number, since it uses less digits than its factorization.

40110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2250 (or 2230 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 40110021 is about 6333.2472713451. The cubic root of 40110021 is about 342.3084577325.

Adding to 40110021 its reverse (12001104), we get a palindrome (52111125).

The spelling of 40110021 in words is "forty million, one hundred ten thousand, twenty-one".