21212201202100 has 72 divisors (see below), whose sum is σ = 49871597263488. Its totient is φ = 7800054259200.

The previous prime is 21212201202097. The next prime is 21212201202103. The reversal of 21212201202100 is 120210221212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21212201202097) and next prime (21212201202103).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212201202103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145017196 + ... + 145163395.

It is an arithmetic number, because the mean of its divisors is an integer number (692661073104).

Almost surely, 2^{21212201202100} is an apocalyptic number.

21212201202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212201202100 is an abundant number, since it is smaller than the sum of its proper divisors (28659396061388).

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

21212201202100 is a wasteful number, since it uses less digits than its factorization.

21212201202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290180665 (or 290180658 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212201202100 its reverse (120210221212), we get a palindrome (21332411423312).

The spelling of 21212201202100 in words is "twenty-one trillion, two hundred twelve billion, two hundred one million, two hundred two thousand, one hundred".