21021011102243 has 2 divisors, whose sum is σ = 21021011102244. Its totient is φ = 21021011102242.

The previous prime is 21021011102213. The next prime is 21021011102269. The reversal of 21021011102243 is 34220111012012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21021011102243 - 2¹⁰ = 21021011101219 is a prime.

It is not a weakly prime, because it can be changed into another prime (21021011102213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510505551121 + 10510505551122.

It is an arithmetic number, because the mean of its divisors is an integer number (10510505551122).

Almost surely, 2^{21021011102243} is an apocalyptic number.

21021011102243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021011102243 is an equidigital number, since it uses as much as digits as its factorization.

21021011102243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21021011102243 its reverse (34220111012012), we get a palindrome (55241122114255).

The spelling of 21021011102243 in words is "twenty-one trillion, twenty-one billion, eleven million, one hundred two thousand, two hundred forty-three".