21121012200139 has 2 divisors, whose sum is σ = 21121012200140. Its totient is φ = 21121012200138.

The previous prime is 21121012200091. The next prime is 21121012200143. The reversal of 21121012200139 is 93100221012112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121012200139 - 2³⁹ = 20571256386251 is a prime.

It is not a weakly prime, because it can be changed into another prime (21121012203139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560506100069 + 10560506100070.

It is an arithmetic number, because the mean of its divisors is an integer number (10560506100070).

Almost surely, 2^{21121012200139} is an apocalyptic number.

21121012200139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121012200139 is an equidigital number, since it uses as much as digits as its factorization.

21121012200139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 21121012200139 in words is "twenty-one trillion, one hundred twenty-one billion, twelve million, two hundred thousand, one hundred thirty-nine".