210012020021989 has 2 divisors, whose sum is σ = 210012020021990. Its totient is φ = 210012020021988.

The previous prime is 210012020021987. The next prime is 210012020022031. The reversal of 210012020021989 is 989120020210012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199582724390625 + 10429295631364 = 14127375^2 + 3229442^2 .

It is a cyclic number.

It is not a de Polignac number, because 210012020021989 - 2¹ = 210012020021987 is a prime.

It is a super-2 number, since 2×210012020021989² (a number of 29 digits) contains 22 as substring.

Together with 210012020021987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210012020021987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105006010010994 + 105006010010995.

It is an arithmetic number, because the mean of its divisors is an integer number (105006010010995).

Almost surely, 2^{210012020021989} is an apocalyptic number.

It is an amenable number.

210012020021989 is a deficient number, since it is larger than the sum of its proper divisors (1).

210012020021989 is an equidigital number, since it uses as much as digits as its factorization.

210012020021989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 210012020021989 in words is "two hundred ten trillion, twelve billion, twenty million, twenty-one thousand, nine hundred eighty-nine".