20211010987 has 2 divisors, whose sum is σ = 20211010988. Its totient is φ = 20211010986.

The previous prime is 20211010933. The next prime is 20211010993. The reversal of 20211010987 is 78901011202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211010987 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211010907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105505493 + 10105505494.

It is an arithmetic number, because the mean of its divisors is an integer number (10105505494).

Almost surely, 2^20211010987 is an apocalyptic number.

20211010987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211010987 is an equidigital number, since it uses as much as digits as its factorization.

20211010987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 20211010987 in words is "twenty billion, two hundred eleven million, ten thousand, nine hundred eighty-seven".