21202100021212 has 24 divisors (see below), whose sum is σ = 40476869258112. Its totient is φ = 9637286559600.

The previous prime is 21202100021117. The next prime is 21202100021239. The reversal of 21202100021212 is 21212000120212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17542803 + ... + 18712405.

It is an arithmetic number, because the mean of its divisors is an integer number (1686536219088).

Almost surely, 2^{21202100021212} is an apocalyptic number.

21202100021212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21202100021212 is a deficient number, since it is larger than the sum of its proper divisors (19274769236900).

21202100021212 is a wasteful number, since it uses less digits than its factorization.

21202100021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581609 (or 1581607 counting only the distinct ones).

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

Adding to 21202100021212 its reverse (21212000120212), we get a palindrome (42414100141424).

The spelling of 21202100021212 in words is "twenty-one trillion, two hundred two billion, one hundred million, twenty-one thousand, two hundred twelve".