21847214377 has 2 divisors, whose sum is σ = 21847214378. Its totient is φ = 21847214376.

The previous prime is 21847214341. The next prime is 21847214387. The reversal of 21847214377 is 77341274812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17905383721 + 3941830656 = 133811^2 + 62784^2 .

It is a cyclic number.

It is not a de Polignac number, because 21847214377 - 2²³ = 21838825769 is a prime.

It is not a weakly prime, because it can be changed into another prime (21847214387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10923607188 + 10923607189.

It is an arithmetic number, because the mean of its divisors is an integer number (10923607189).

Almost surely, 2^21847214377 is an apocalyptic number.

It is an amenable number.

21847214377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21847214377 is an equidigital number, since it uses as much as digits as its factorization.

21847214377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 526848, while the sum is 46.

The spelling of 21847214377 in words is "twenty-one billion, eight hundred forty-seven million, two hundred fourteen thousand, three hundred seventy-seven".