40106221 has 2 divisors, whose sum is σ = 40106222. Its totient is φ = 40106220.

The previous prime is 40106197. The next prime is 40106239. The reversal of 40106221 is 12260104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32604100 + 7502121 = 5710^2 + 2739^2 .

It is a cyclic number.

It is not a de Polignac number, because 40106221 - 2⁵ = 40106189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40106195 and 40106204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40106291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20053110 + 20053111.

It is an arithmetic number, because the mean of its divisors is an integer number (20053111).

Almost surely, 2^40106221 is an apocalyptic number.

It is an amenable number.

40106221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40106221 is an equidigital number, since it uses as much as digits as its factorization.

40106221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 40106221 is about 6332.9472601625. The cubic root of 40106221 is about 342.2976473566.

Adding to 40106221 its reverse (12260104), we get a palindrome (52366325).

The spelling of 40106221 in words is "forty million, one hundred six thousand, two hundred twenty-one".