20211019739987 has 2 divisors, whose sum is σ = 20211019739988. Its totient is φ = 20211019739986.

The previous prime is 20211019739909. The next prime is 20211019740019. The reversal of 20211019739987 is 78993791011202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20211019739987 - 2²⁶ = 20210952631123 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211019729987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105509869993 + 10105509869994.

It is an arithmetic number, because the mean of its divisors is an integer number (10105509869994).

Almost surely, 2^{20211019739987} is an apocalyptic number.

20211019739987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211019739987 is an equidigital number, since it uses as much as digits as its factorization.

20211019739987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3429216, while the sum is 59.

The spelling of 20211019739987 in words is "twenty trillion, two hundred eleven billion, nineteen million, seven hundred thirty-nine thousand, nine hundred eighty-seven".