21112022221212 has 48 divisors (see below), whose sum is σ = 53388625257632. Its totient is φ = 6454630990080.

The previous prime is 21112022221067. The next prime is 21112022221349. The reversal of 21112022221212 is 21212222021112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430973839 + ... + 431022822.

Almost surely, 2^{21112022221212} is an apocalyptic number.

It is an amenable number.

21112022221212 is an abundant number, since it is smaller than the sum of its proper divisors (32276603036420).

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

21112022221212 is a wasteful number, since it uses less digits than its factorization.

21112022221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861996838 (or 861996836 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21112022221212 its reverse (21212222021112), we get a palindrome (42324244242324).

The spelling of 21112022221212 in words is "twenty-one trillion, one hundred twelve billion, twenty-two million, two hundred twenty-one thousand, two hundred twelve".