21101122109939 has 2 divisors, whose sum is σ = 21101122109940. Its totient is φ = 21101122109938.

The previous prime is 21101122109891. The next prime is 21101122109999. The reversal of 21101122109939 is 93990122110112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101122109939 - 2⁴⁰ = 20001610482163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21101122109896 and 21101122109905.

It is not a weakly prime, because it can be changed into another prime (21101122109999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550561054969 + 10550561054970.

It is an arithmetic number, because the mean of its divisors is an integer number (10550561054970).

Almost surely, 2^{21101122109939} is an apocalyptic number.

21101122109939 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101122109939 is an equidigital number, since it uses as much as digits as its factorization.

21101122109939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 41.

The spelling of 21101122109939 in words is "twenty-one trillion, one hundred one billion, one hundred twenty-two million, one hundred nine thousand, nine hundred thirty-nine".