210020781867612 has 24 divisors (see below), whose sum is σ = 502000893245712. Its totient is φ = 68299441257600.

The previous prime is 210020781867551. The next prime is 210020781867649. The reversal of 210020781867612 is 216768187020012.

It is a happy number.

It is a super-2 number, since 2×210020781867612² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213435753439 + ... + 213435754422.

It is an arithmetic number, because the mean of its divisors is an integer number (20916703885238).

Almost surely, 2^{210020781867612} is an apocalyptic number.

It is an amenable number.

210020781867612 is an abundant number, since it is smaller than the sum of its proper divisors (291980111378100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210020781867612 is a wasteful number, since it uses less digits than its factorization.

210020781867612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426871507909 (or 426871507907 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 51.

The spelling of 210020781867612 in words is "two hundred ten trillion, twenty billion, seven hundred eighty-one million, eight hundred sixty-seven thousand, six hundred twelve".