21112112021212 has 24 divisors (see below), whose sum is σ = 38393968636800. Its totient is φ = 10146977407680.

The previous prime is 21112112021167. The next prime is 21112112021279. The reversal of 21112112021212 is 21212021121112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112112021212.

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, 571320343 + ... + 571357294.

It is an arithmetic number, because the mean of its divisors is an integer number (1599748693200).

Almost surely, 2^{21112112021212} is an apocalyptic number.

It is an amenable number.

21112112021212 is a deficient number, since it is larger than the sum of its proper divisors (17281856615588).

21112112021212 is a wasteful number, since it uses less digits than its factorization.

21112112021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142677821 (or 1142677819 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21112112021212 its reverse (21212021121112), we get a palindrome (42324133142324).

The spelling of 21112112021212 in words is "twenty-one trillion, one hundred twelve billion, one hundred twelve million, twenty-one thousand, two hundred twelve".