21020012102239 has 2 divisors, whose sum is σ = 21020012102240. Its totient is φ = 21020012102238.

The previous prime is 21020012102087. The next prime is 21020012102269. The reversal of 21020012102239 is 93220121002012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020012102239 - 2²⁵ = 21019978547807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020012102269) 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, 10510006051119 + 10510006051120.

It is an arithmetic number, because the mean of its divisors is an integer number (10510006051120).

Almost surely, 2^{21020012102239} is an apocalyptic number.

21020012102239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020012102239 is an equidigital number, since it uses as much as digits as its factorization.

21020012102239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21020012102239 in words is "twenty-one trillion, twenty billion, twelve million, one hundred two thousand, two hundred thirty-nine".