20012100100 has 18 divisors (see below), whose sum is σ = 43426257434. Its totient is φ = 8004840000.

The previous prime is 20012100079. The next prime is 20012100133. The reversal of 20012100100 is 100121002.

It can be written as a sum of positive squares in 3 ways, for example, as 417139776 + 19594960324 = 20424^2 + 139982^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100060401 + ... + 100060600.

Almost surely, 2^20012100100 is an apocalyptic number.

20012100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012100100 is an abundant number, since it is smaller than the sum of its proper divisors (23414157334).

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

20012100100 is a wasteful number, since it uses less digits than its factorization.

20012100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200121015 (or 200121008 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20012100100 its reverse (100121002), we get a palindrome (20112221102).

The spelling of 20012100100 in words is "twenty billion, twelve million, one hundred thousand, one hundred".