21012100210139 has 2 divisors, whose sum is σ = 21012100210140. Its totient is φ = 21012100210138.

The previous prime is 21012100210109. The next prime is 21012100210141. The reversal of 21012100210139 is 93101200121012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012100210139 - 2¹² = 21012100206043 is a prime.

Together with 21012100210141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21012100210109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506050105069 + 10506050105070.

It is an arithmetic number, because the mean of its divisors is an integer number (10506050105070).

Almost surely, 2^{21012100210139} is an apocalyptic number.

21012100210139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012100210139 is an equidigital number, since it uses as much as digits as its factorization.

21012100210139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 21012100210139 in words is "twenty-one trillion, twelve billion, one hundred million, two hundred ten thousand, one hundred thirty-nine".