21010220039 has 2 divisors, whose sum is σ = 21010220040. Its totient is φ = 21010220038.

The previous prime is 21010220027. The next prime is 21010220041. The reversal of 21010220039 is 93002201012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21010220039 - 2¹² = 21010215943 is a prime.

Together with 21010220041, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21010220039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010220059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505110019 + 10505110020.

It is an arithmetic number, because the mean of its divisors is an integer number (10505110020).

Almost surely, 2^21010220039 is an apocalyptic number.

21010220039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010220039 is an equidigital number, since it uses as much as digits as its factorization.

21010220039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The spelling of 21010220039 in words is "twenty-one billion, ten million, two hundred twenty thousand, thirty-nine".