21120210209699 has 2 divisors, whose sum is σ = 21120210209700. Its totient is φ = 21120210209698.

The previous prime is 21120210209687. The next prime is 21120210209789. The reversal of 21120210209699 is 99690201202112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120210209699 - 2⁴⁴ = 3528024165283 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21120210209629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560105104849 + 10560105104850.

It is an arithmetic number, because the mean of its divisors is an integer number (10560105104850).

Almost surely, 2^{21120210209699} is an apocalyptic number.

21120210209699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120210209699 is an equidigital number, since it uses as much as digits as its factorization.

21120210209699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 21120210209699 in words is "twenty-one trillion, one hundred twenty billion, two hundred ten million, two hundred nine thousand, six hundred ninety-nine".