21983327777 has 2 divisors, whose sum is σ = 21983327778. Its totient is φ = 21983327776.

The previous prime is 21983327713. The next prime is 21983327791. The reversal of 21983327777 is 77772338912.

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., 20563846801 + 1419480976 = 143401^2 + 37676^2 .

It is a cyclic number.

It is not a de Polignac number, because 21983327777 - 2⁶ = 21983327713 is a prime.

It is not a weakly prime, because it can be changed into another prime (21983327477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10991663888 + 10991663889.

It is an arithmetic number, because the mean of its divisors is an integer number (10991663889).

Almost surely, 2^21983327777 is an apocalyptic number.

It is an amenable number.

21983327777 is a deficient number, since it is larger than the sum of its proper divisors (1).

21983327777 is an equidigital number, since it uses as much as digits as its factorization.

21983327777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6223392, while the sum is 56.

The spelling of 21983327777 in words is "twenty-one billion, nine hundred eighty-three million, three hundred twenty-seven thousand, seven hundred seventy-seven".