210021010020989 has 2 divisors, whose sum is σ = 210021010020990. Its totient is φ = 210021010020988.

The previous prime is 210021010020919. The next prime is 210021010021057. The reversal of 210021010020989 is 989020010120012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178140193404889 + 31880816616100 = 13346917^2 + 5646310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021010020989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210021010020919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010505010494 + 105010505010495.

It is an arithmetic number, because the mean of its divisors is an integer number (105010505010495).

Almost surely, 2^{210021010020989} is an apocalyptic number.

It is an amenable number.

210021010020989 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021010020989 is an equidigital number, since it uses as much as digits as its factorization.

210021010020989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 210021010020989 in words is "two hundred ten trillion, twenty-one billion, ten million, twenty thousand, nine hundred eighty-nine".