21033003077 has 2 divisors, whose sum is σ = 21033003078. Its totient is φ = 21033003076.

The previous prime is 21033003067. The next prime is 21033003107. The reversal of 21033003077 is 77030033012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19873668676 + 1159334401 = 140974^2 + 34049^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033003077 - 2³² = 16738035781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033003067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516501538 + 10516501539.

It is an arithmetic number, because the mean of its divisors is an integer number (10516501539).

Almost surely, 2^21033003077 is an apocalyptic number.

It is an amenable number.

21033003077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033003077 is an equidigital number, since it uses as much as digits as its factorization.

21033003077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 26.

Adding to 21033003077 its reverse (77030033012), we get a palindrome (98063036089).

The spelling of 21033003077 in words is "twenty-one billion, thirty-three million, three thousand, seventy-seven".