21201222020212 has 96 divisors (see below), whose sum is σ = 40312364601600. Its totient is φ = 9698420293632.

The previous prime is 21201222020183. The next prime is 21201222020221. The reversal of 21201222020212 is 21202022210212.

It is a self number, because there is not a number n which added to its sum of digits gives 21201222020212.

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, 3174307489 + ... + 3174314167.

It is an arithmetic number, because the mean of its divisors is an integer number (419920464600).

Almost surely, 2^{21201222020212} is an apocalyptic number.

It is an amenable number.

21201222020212 is a deficient number, since it is larger than the sum of its proper divisors (19111142581388).

21201222020212 is a wasteful number, since it uses less digits than its factorization.

21201222020212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8105 (or 8103 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21201222020212 its reverse (21202022210212), we get a palindrome (42403244230424).

The spelling of 21201222020212 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, twenty thousand, two hundred twelve".