21020220122039 has 2 divisors, whose sum is σ = 21020220122040. Its totient is φ = 21020220122038.

The previous prime is 21020220121919. The next prime is 21020220122087. The reversal of 21020220122039 is 93022102202012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020220122039 - 2⁸ = 21020220121783 is a prime.

It is a super-3 number, since 3×21020220122039³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020220121999 and 21020220122017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020228122039) 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, 10510110061019 + 10510110061020.

It is an arithmetic number, because the mean of its divisors is an integer number (10510110061020).

Almost surely, 2^{21020220122039} is an apocalyptic number.

21020220122039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020220122039 is an equidigital number, since it uses as much as digits as its factorization.

21020220122039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 21020220122039 in words is "twenty-one trillion, twenty billion, two hundred twenty million, one hundred twenty-two thousand, thirty-nine".