21778077043 has 2 divisors, whose sum is σ = 21778077044. Its totient is φ = 21778077042.

The previous prime is 21778076993. The next prime is 21778077107. The reversal of 21778077043 is 34077087712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21778077043 - 2²⁹ = 21241206131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21778076984 and 21778077002.

It is not a weakly prime, because it can be changed into another prime (21778075043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10889038521 + 10889038522.

It is an arithmetic number, because the mean of its divisors is an integer number (10889038522).

Almost surely, 2^21778077043 is an apocalyptic number.

21778077043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21778077043 is an equidigital number, since it uses as much as digits as its factorization.

21778077043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 460992, while the sum is 46.

The spelling of 21778077043 in words is "twenty-one billion, seven hundred seventy-eight million, seventy-seven thousand, forty-three".