40107021 has 4 divisors (see below), whose sum is σ = 53476032. Its totient is φ = 26738012.

The previous prime is 40107017. The next prime is 40107037. The reversal of 40107021 is 12070104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40107021 - 2² = 40107017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40107721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6684501 + ... + 6684506.

It is an arithmetic number, because the mean of its divisors is an integer number (13369008).

Almost surely, 2^40107021 is an apocalyptic number.

It is an amenable number.

40107021 is a deficient number, since it is larger than the sum of its proper divisors (13369011).

40107021 is a wasteful number, since it uses less digits than its factorization.

40107021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13369010.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 40107021 is about 6333.0104215926. The cubic root of 40107021 is about 342.2999232819.

Adding to 40107021 its reverse (12070104), we get a palindrome (52177125).

The spelling of 40107021 in words is "forty million, one hundred seven thousand, twenty-one".