21212200021012 has 96 divisors (see below), whose sum is σ = 49842859659264. Its totient is φ = 7628517360000.

The previous prime is 21212200020983. The next prime is 21212200021037. The reversal of 21212200021012 is 21012000221212.

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 31 ways as a sum of consecutive naturals, for example, 163102003 + ... + 163232005.

It is an arithmetic number, because the mean of its divisors is an integer number (519196454784).

Almost surely, 2^{21212200021012} is an apocalyptic number.

21212200021012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21212200021012 is an abundant number, since it is smaller than the sum of its proper divisors (28630659638252).

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

21212200021012 is a wasteful number, since it uses less digits than its factorization.

21212200021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170789 (or 170787 counting only the distinct ones).

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

Adding to 21212200021012 its reverse (21012000221212), we get a palindrome (42224200242224).

The spelling of 21212200021012 in words is "twenty-one trillion, two hundred twelve billion, two hundred million, twenty-one thousand, twelve".