40103021 has 6 divisors (see below), whose sum is σ = 46650510. Its totient is φ = 34373976.

The previous prime is 40103009. The next prime is 40103039. The reversal of 40103021 is 12030104.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 29278921 + 10824100 = 5411^2 + 3290^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40103021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40102993 and 40103011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40103321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409166 + ... + 409263.

It is an arithmetic number, because the mean of its divisors is an integer number (7775085).

Almost surely, 2^40103021 is an apocalyptic number.

It is an amenable number.

40103021 is a deficient number, since it is larger than the sum of its proper divisors (6547489).

40103021 is an equidigital number, since it uses as much as digits as its factorization.

40103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818443 (or 818436 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 40103021 is about 6332.6946081427. The cubic root of 40103021 is about 342.2885433524.

Adding to 40103021 its reverse (12030104), we get a palindrome (52133125).

The spelling of 40103021 in words is "forty million, one hundred three thousand, twenty-one".