40216221 has 6 divisors (see below), whose sum is σ = 58090110. Its totient is φ = 26810808.

The previous prime is 40216219. The next prime is 40216273. The reversal of 40216221 is 12261204.

40216221 is a `hidden beast` number, since 40 + 2 + 1 + 622 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 35640900 + 4575321 = 5970^2 + 2139^2 .

It is not a de Polignac number, because 40216221 - 2¹ = 40216219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40216194 and 40216203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40216321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2234226 + ... + 2234243.

It is an arithmetic number, because the mean of its divisors is an integer number (9681685).

Almost surely, 2^40216221 is an apocalyptic number.

It is an amenable number.

40216221 is a deficient number, since it is larger than the sum of its proper divisors (17873889).

40216221 is a wasteful number, since it uses less digits than its factorization.

40216221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4468475 (or 4468472 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 40216221 is about 6341.6260533084. The cubic root of 40216221 is about 342.6103035067.

Adding to 40216221 its reverse (12261204), we get a palindrome (52477425).

The spelling of 40216221 in words is "forty million, two hundred sixteen thousand, two hundred twenty-one".