109384820021 has 2 divisors, whose sum is σ = 109384820022. Its totient is φ = 109384820020.

The previous prime is 109384820003. The next prime is 109384820023. The reversal of 109384820021 is 120028483901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98838556996 + 10546263025 = 314386^2 + 102695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109384820021 is a prime.

Together with 109384820023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109384820023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54692410010 + 54692410011.

It is an arithmetic number, because the mean of its divisors is an integer number (54692410011).

Almost surely, 2^109384820021 is an apocalyptic number.

It is an amenable number.

109384820021 is a deficient number, since it is larger than the sum of its proper divisors (1).

109384820021 is an equidigital number, since it uses as much as digits as its factorization.

109384820021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 109384820021 in words is "one hundred nine billion, three hundred eighty-four million, eight hundred twenty thousand, twenty-one".