21212200011021 has 32 divisors (see below), whose sum is σ = 28680469278720. Its totient is φ = 13943199816000.

The previous prime is 21212200011001. The next prime is 21212200011049. The reversal of 21212200011021 is 12011000221212.

It is not a de Polignac number, because 21212200011021 - 2⁹ = 21212200010509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212200011001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1457775696 + ... + 1457790246.

It is an arithmetic number, because the mean of its divisors is an integer number (896264664960).

Almost surely, 2^{21212200011021} is an apocalyptic number.

It is an amenable number.

21212200011021 is a deficient number, since it is larger than the sum of its proper divisors (7468269267699).

21212200011021 is a wasteful number, since it uses less digits than its factorization.

21212200011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22697.

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

Adding to 21212200011021 its reverse (12011000221212), we get a palindrome (33223200232233).

The spelling of 21212200011021 in words is "twenty-one trillion, two hundred twelve billion, two hundred million, eleven thousand, twenty-one".