40011221 has 4 divisors (see below), whose sum is σ = 40043232. Its totient is φ = 39979212.

The previous prime is 40011211. The next prime is 40011233. The reversal of 40011221 is 12211004.

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 40011221 - 2²² = 35816917 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 (40011211) 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, 14051 + ... + 16656.

It is an arithmetic number, because the mean of its divisors is an integer number (10010808).

Almost surely, 2^40011221 is an apocalyptic number.

It is an amenable number.

40011221 is a deficient number, since it is larger than the sum of its proper divisors (32011).

40011221 is a wasteful number, since it uses less digits than its factorization.

40011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32010.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 40011221 is about 6325.4423560728. The cubic root of 40011221 is about 342.0271657456.

Adding to 40011221 its reverse (12211004), we get a palindrome (52222225).

The spelling of 40011221 in words is "forty million, eleven thousand, two hundred twenty-one".