21002110139 has 2 divisors, whose sum is σ = 21002110140. Its totient is φ = 21002110138.

The previous prime is 21002110069. The next prime is 21002110141. The reversal of 21002110139 is 93101120012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002110139 - 2¹² = 21002106043 is a prime.

Together with 21002110141, 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 21002110139.

It is not a weakly prime, because it can be changed into another prime (21002110159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501055069 + 10501055070.

It is an arithmetic number, because the mean of its divisors is an integer number (10501055070).

Almost surely, 2^21002110139 is an apocalyptic number.

21002110139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002110139 is an equidigital number, since it uses as much as digits as its factorization.

21002110139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 21002110139 in words is "twenty-one billion, two million, one hundred ten thousand, one hundred thirty-nine".