40121221 has 8 divisors (see below), whose sum is σ = 46828800. Its totient is φ = 33657648.

The previous prime is 40121219. The next prime is 40121231. The reversal of 40121221 is 12212104.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40121221 - 2¹ = 40121219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40121231) 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 7 ways as a sum of consecutive naturals, for example, 60646 + ... + 61303.

It is an arithmetic number, because the mean of its divisors is an integer number (5853600).

Almost surely, 2^40121221 is an apocalyptic number.

It is an amenable number.

40121221 is a deficient number, since it is larger than the sum of its proper divisors (6707579).

40121221 is a wasteful number, since it uses less digits than its factorization.

40121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122003.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 40121221 is about 6334.1314321697. The cubic root of 40121221 is about 342.3403159219.

Adding to 40121221 its reverse (12212104), we get a palindrome (52333325).

The spelling of 40121221 in words is "forty million, one hundred twenty-one thousand, two hundred twenty-one".