20100020210100 has 108 divisors (see below), whose sum is σ = 63005467144620. Its totient is φ = 5359744166400.

The previous prime is 20100020210087. The next prime is 20100020210143. The reversal of 20100020210100 is 101202000102.

It can be written as a sum of positive squares in 6 ways, for example, as 1564205465124 + 18535814744976 = 1250682^2 + 4305324^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18295146 + ... + 19362654.

Almost surely, 2^{20100020210100} is an apocalyptic number.

20100020210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100020210100 is an abundant number, since it is smaller than the sum of its proper divisors (42905446934520).

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

20100020210100 is a wasteful number, since it uses less digits than its factorization.

20100020210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088450 (or 1088440 counting only the distinct ones).

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

Adding to 20100020210100 its reverse (101202000102), we get a palindrome (20201222210202).

The spelling of 20100020210100 in words is "twenty trillion, one hundred billion, twenty million, two hundred ten thousand, one hundred".