40670221 has 2 divisors, whose sum is σ = 40670222. Its totient is φ = 40670220.

The previous prime is 40670219. The next prime is 40670251. The reversal of 40670221 is 12207604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38378025 + 2292196 = 6195^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 40670221 - 2¹ = 40670219 is a prime.

Together with 40670219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 40670192 and 40670201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40670251) 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 as a sum of consecutive naturals, namely, 20335110 + 20335111.

It is an arithmetic number, because the mean of its divisors is an integer number (20335111).

Almost surely, 2^40670221 is an apocalyptic number.

It is an amenable number.

40670221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40670221 is an equidigital number, since it uses as much as digits as its factorization.

40670221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 40670221 is about 6377.3208324499. The cubic root of 40670221 is about 343.8947222685.

Adding to 40670221 its reverse (12207604), we get a palindrome (52877825).

The spelling of 40670221 in words is "forty million, six hundred seventy thousand, two hundred twenty-one".