78012211 has 2 divisors, whose sum is σ = 78012212. Its totient is φ = 78012210.

The previous prime is 78012199. The next prime is 78012239. The reversal of 78012211 is 11221087.

It is a weak prime.

It is an emirp because it is prime and its reverse (11221087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78012211 - 2¹⁹ = 77487923 is a prime.

It is not a weakly prime, because it can be changed into another prime (78012811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39006105 + 39006106.

It is an arithmetic number, because the mean of its divisors is an integer number (39006106).

Almost surely, 2^78012211 is an apocalyptic number.

78012211 is a deficient number, since it is larger than the sum of its proper divisors (1).

78012211 is an equidigital number, since it uses as much as digits as its factorization.

78012211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 78012211 is about 8832.4521510167. The cubic root of 78012211 is about 427.2881633462.

Adding to 78012211 its reverse (11221087), we get a palindrome (89233298).

The spelling of 78012211 in words is "seventy-eight million, twelve thousand, two hundred eleven".