20212102100 has 36 divisors (see below), whose sum is σ = 44930033148. Its totient is φ = 7887648000.

The previous prime is 20212102063. The next prime is 20212102153. The reversal of 20212102100 is 120121202.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 10228895044 + 9983207056 = 101138^2 + 99916^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2460791 + ... + 2468990.

Almost surely, 2^20212102100 is an apocalyptic number.

20212102100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212102100 is an abundant number, since it is smaller than the sum of its proper divisors (24717931048).

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

20212102100 is a wasteful number, since it uses less digits than its factorization.

20212102100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4929836 (or 4929829 counting only the distinct ones).

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

Adding to 20212102100 its reverse (120121202), we get a palindrome (20332223302).

The spelling of 20212102100 in words is "twenty billion, two hundred twelve million, one hundred two thousand, one hundred".