40010221 has 2 divisors, whose sum is σ = 40010222. Its totient is φ = 40010220.

The previous prime is 40010213. The next prime is 40010237. The reversal of 40010221 is 12201004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21261321 + 18748900 = 4611^2 + 4330^2 .

It is a cyclic number.

It is not a de Polignac number, because 40010221 - 2³ = 40010213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40010198 and 40010207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40010291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20005110 + 20005111.

It is an arithmetic number, because the mean of its divisors is an integer number (20005111).

Almost surely, 2^40010221 is an apocalyptic number.

It is an amenable number.

40010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40010221 is an equidigital number, since it uses as much as digits as its factorization.

40010221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 40010221 is about 6325.3633097238. The cubic root of 40010221 is about 342.0243162948.

Adding to 40010221 its reverse (12201004), we get a palindrome (52211225).

The spelling of 40010221 in words is "forty million, ten thousand, two hundred twenty-one".