40921217 has 2 divisors, whose sum is σ = 40921218. Its totient is φ = 40921216.

The previous prime is 40921207. The next prime is 40921219. The reversal of 40921217 is 71212904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33131536 + 7789681 = 5756^2 + 2791^2 .

It is a cyclic number.

It is not a de Polignac number, because 40921217 - 2¹⁰ = 40920193 is a prime.

It is a super-2 number, since 2×40921217² = 3349092001522178, which contains 22 as substring.

Together with 40921219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40921219) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20460608 + 20460609.

It is an arithmetic number, because the mean of its divisors is an integer number (20460609).

Almost surely, 2^40921217 is an apocalyptic number.

It is an amenable number.

40921217 is a deficient number, since it is larger than the sum of its proper divisors (1).

40921217 is an equidigital number, since it uses as much as digits as its factorization.

40921217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 40921217 is about 6396.9693605644. The cubic root of 40921217 is about 344.6007199025.

The spelling of 40921217 in words is "forty million, nine hundred twenty-one thousand, two hundred seventeen".