40042221 has 4 divisors (see below), whose sum is σ = 53389632. Its totient is φ = 26694812.

The previous prime is 40042213. The next prime is 40042229. The reversal of 40042221 is 12224004.

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 an interprime number because it is at equal distance from previous prime (40042213) and next prime (40042229).

It is a cyclic number.

It is not a de Polignac number, because 40042221 - 2³ = 40042213 is a prime.

It is a super-2 number, since 2×40042221² = 3206758925225682, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40042221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40042229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6673701 + ... + 6673706.

It is an arithmetic number, because the mean of its divisors is an integer number (13347408).

Almost surely, 2^40042221 is an apocalyptic number.

It is an amenable number.

40042221 is a deficient number, since it is larger than the sum of its proper divisors (13347411).

40042221 is a wasteful number, since it uses less digits than its factorization.

40042221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13347410.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 40042221 is about 6327.8923031291. The cubic root of 40042221 is about 342.1154751811.

Adding to 40042221 its reverse (12224004), we get a palindrome (52266225).

The spelling of 40042221 in words is "forty million, forty-two thousand, two hundred twenty-one".