21212011000100 has 18 divisors (see below), whose sum is σ = 46030063870434. Its totient is φ = 8484804400000.

The previous prime is 21212011000093. The next prime is 21212011000109. The reversal of 21212011000100 is 100011021212.

It can be written as a sum of positive squares in 3 ways, for example, as 204767110144 + 21007243889956 = 452512^2 + 4583366^2 .

It is not an unprimeable number, because it can be changed into a prime (21212011000109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106060054901 + ... + 106060055100.

Almost surely, 2^{21212011000100} is an apocalyptic number.

21212011000100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212011000100 is an abundant number, since it is smaller than the sum of its proper divisors (24818052870334).

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

21212011000100 is a wasteful number, since it uses less digits than its factorization.

21212011000100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212120110015 (or 212120110008 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21212011000100 its reverse (100011021212), we get a palindrome (21312022021312).

The spelling of 21212011000100 in words is "twenty-one trillion, two hundred twelve billion, eleven million, one hundred", and thus it is an aban number.