21211100021202 has 256 divisors, whose sum is σ = 56179121553408. Its totient is φ = 5188736931840.

The previous prime is 21211100021147. The next prime is 21211100021203. The reversal of 21211100021202 is 20212000111212.

It is not an unprimeable number, because it can be changed into a prime (21211100021203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 41706798 + ... + 42212310.

It is an arithmetic number, because the mean of its divisors is an integer number (219449693568).

Almost surely, 2^{21211100021202} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211100021202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28089560776704).

21211100021202 is an abundant number, since it is smaller than the sum of its proper divisors (34968021532206).

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

21211100021202 is a wasteful number, since it uses less digits than its factorization.

21211100021202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505673.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211100021202 its reverse (20212000111212), we get a palindrome (41423100132414).

The spelling of 21211100021202 in words is "twenty-one trillion, two hundred eleven billion, one hundred million, twenty-one thousand, two hundred two".