21023301077 has 2 divisors, whose sum is σ = 21023301078. Its totient is φ = 21023301076.

The previous prime is 21023301067. The next prime is 21023301121. The reversal of 21023301077 is 77010332012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19806058756 + 1217242321 = 140734^2 + 34889^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023301077 - 2⁸ = 21023300821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21023301007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511650538 + 10511650539.

It is an arithmetic number, because the mean of its divisors is an integer number (10511650539).

Almost surely, 2^21023301077 is an apocalyptic number.

It is an amenable number.

21023301077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023301077 is an equidigital number, since it uses as much as digits as its factorization.

21023301077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 26.

Adding to 21023301077 its reverse (77010332012), we get a palindrome (98033633089).

The spelling of 21023301077 in words is "twenty-one billion, twenty-three million, three hundred one thousand, seventy-seven".