20012100210 has 24 divisors (see below), whose sum is σ = 52031460780. Its totient is φ = 5336560032.

The previous prime is 20012100149. The next prime is 20012100211. The reversal of 20012100210 is 1200121002.

It can be written as a sum of positive squares in 2 ways, for example, as 19044828009 + 967272201 = 138003^2 + 31101^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20012100192 and 20012100201.

It is not an unprimeable number, because it can be changed into a prime (20012100211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111178245 + ... + 111178424.

Almost surely, 2^20012100210 is an apocalyptic number.

20012100210 is an abundant number, since it is smaller than the sum of its proper divisors (32019360570).

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

20012100210 is a wasteful number, since it uses less digits than its factorization.

20012100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222356682 (or 222356679 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20012100210 its reverse (1200121002), we get a palindrome (21212221212).

The spelling of 20012100210 in words is "twenty billion, twelve million, one hundred thousand, two hundred ten".