21022112210212 has 24 divisors (see below), whose sum is σ = 38024102503296. Its totient is φ = 10163471827488.

The previous prime is 21022112210159. The next prime is 21022112210219. The reversal of 21022112210212 is 21201221122012.

It is a self number, because there is not a number n which added to its sum of digits gives 21022112210212.

It is not an unprimeable number, because it can be changed into a prime (21022112210219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673597323 + ... + 673628530.

It is an arithmetic number, because the mean of its divisors is an integer number (1584337604304).

Almost surely, 2^{21022112210212} is an apocalyptic number.

It is an amenable number.

21022112210212 is a deficient number, since it is larger than the sum of its proper divisors (17001990293084).

21022112210212 is a wasteful number, since it uses less digits than its factorization.

21022112210212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347225987 (or 1347225985 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21022112210212 its reverse (21201221122012), we get a palindrome (42223333332224).

The spelling of 21022112210212 in words is "twenty-one trillion, twenty-two billion, one hundred twelve million, two hundred ten thousand, two hundred twelve".