40211220391 has 2 divisors, whose sum is σ = 40211220392. Its totient is φ = 40211220390.

The previous prime is 40211220389. The next prime is 40211220457. The reversal of 40211220391 is 19302211204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40211220391 - 2¹ = 40211220389 is a prime.

Together with 40211220389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40217220391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20105610195 + 20105610196.

It is an arithmetic number, because the mean of its divisors is an integer number (20105610196).

Almost surely, 2^40211220391 is an apocalyptic number.

40211220391 is a deficient number, since it is larger than the sum of its proper divisors (1).

40211220391 is an equidigital number, since it uses as much as digits as its factorization.

40211220391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 40211220391 its reverse (19302211204), we get a palindrome (59513431595).

The spelling of 40211220391 in words is "forty billion, two hundred eleven million, two hundred twenty thousand, three hundred ninety-one".