40071021 has 16 divisors (see below), whose sum is σ = 54829440. Its totient is φ = 26020800.

The previous prime is 40071013. The next prime is 40071029. The reversal of 40071021 is 12017004.

It is an interprime number because it is at equal distance from previous prime (40071013) and next prime (40071029).

It is not a de Polignac number, because 40071021 - 2³ = 40071013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40071029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23175 + ... + 24843.

It is an arithmetic number, because the mean of its divisors is an integer number (3426840).

Almost surely, 2^40071021 is an apocalyptic number.

It is an amenable number.

40071021 is a deficient number, since it is larger than the sum of its proper divisors (14758419).

40071021 is a wasteful number, since it uses less digits than its factorization.

40071021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876.

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

The square root of 40071021 is about 6330.1675333280. The cubic root of 40071021 is about 342.1974766633.

Adding to 40071021 its reverse (12017004), we get a palindrome (52088025).

The spelling of 40071021 in words is "forty million, seventy-one thousand, twenty-one".