21011120993 has 2 divisors, whose sum is σ = 21011120994. Its totient is φ = 21011120992.

The previous prime is 21011120989. The next prime is 21011121011. The reversal of 21011120993 is 39902111012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20999777569 + 11343424 = 144913^2 + 3368^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011120993 - 2² = 21011120989 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011120903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505560496 + 10505560497.

It is an arithmetic number, because the mean of its divisors is an integer number (10505560497).

Almost surely, 2^21011120993 is an apocalyptic number.

It is an amenable number.

21011120993 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011120993 is an equidigital number, since it uses as much as digits as its factorization.

21011120993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 21011120993 in words is "twenty-one billion, eleven million, one hundred twenty thousand, nine hundred ninety-three".