21210101200139 has 2 divisors, whose sum is σ = 21210101200140. Its totient is φ = 21210101200138.

The previous prime is 21210101200121. The next prime is 21210101200207. The reversal of 21210101200139 is 93100210101212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210101200139 - 2⁸ = 21210101199883 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210181200139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605050600069 + 10605050600070.

It is an arithmetic number, because the mean of its divisors is an integer number (10605050600070).

Almost surely, 2^{21210101200139} is an apocalyptic number.

21210101200139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210101200139 is an equidigital number, since it uses as much as digits as its factorization.

21210101200139 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 23.

The spelling of 21210101200139 in words is "twenty-one trillion, two hundred ten billion, one hundred one million, two hundred thousand, one hundred thirty-nine".