12021223111212 has 48 divisors (see below), whose sum is σ = 32089609181952. Its totient is φ = 3431097936960.

The previous prime is 12021223111207. The next prime is 12021223111229. The reversal of 12021223111212 is 21211132212021.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 73610403 + ... + 73773530.

It is an arithmetic number, because the mean of its divisors is an integer number (668533524624).

Almost surely, 2^{12021223111212} is an apocalyptic number.

12021223111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12021223111212 is an abundant number, since it is smaller than the sum of its proper divisors (20068386070740).

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

12021223111212 is a wasteful number, since it uses less digits than its factorization.

12021223111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147384918 (or 147384916 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 12021223111212 its reverse (21211132212021), we get a palindrome (33232355323233).

The spelling of 12021223111212 in words is "twelve trillion, twenty-one billion, two hundred twenty-three million, one hundred eleven thousand, two hundred twelve".