210102120020 has 24 divisors (see below), whose sum is σ = 475154025864. Its totient is φ = 77576167296.

The previous prime is 210102120001. The next prime is 210102120037. The reversal of 210102120020 is 20021201012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 46730896 + 210055389124 = 6836^2 + 458318^2 .

It is a junction number, because it is equal to n+sod(n) for n = 210102119983 and 210102120010.

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, 404042279 + ... + 404042798.

It is an arithmetic number, because the mean of its divisors is an integer number (19798084411).

Almost surely, 2^210102120020 is an apocalyptic number.

210102120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210102120020 is an abundant number, since it is smaller than the sum of its proper divisors (265051905844).

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

210102120020 is a wasteful number, since it uses less digits than its factorization.

210102120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808085099 (or 808085097 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 210102120020 its reverse (20021201012), we get a palindrome (230123321032).

The spelling of 210102120020 in words is "two hundred ten billion, one hundred two million, one hundred twenty thousand, twenty".