12121997522112 has 168 divisors, whose sum is σ = 35496807270912. Its totient is φ = 3953354227200.

The previous prime is 12121997522101. The next prime is 12121997522119. The reversal of 12121997522112 is 21122579912121.

12121997522112 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 1 + 9 + 9 + 7 + 522 + 112 = 666.

It is not an unprimeable number, because it can be changed into a prime (12121997522119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81439437 + ... + 81588147.

Almost surely, 2^{12121997522112} is an apocalyptic number.

12121997522112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12121997522112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17748403635456).

12121997522112 is an abundant number, since it is smaller than the sum of its proper divisors (23374809748800).

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

12121997522112 is a wasteful number, since it uses less digits than its factorization.

12121997522112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151787 (or 151774 counting only the distinct ones).

The product of its digits is 90720, while the sum is 45.

The spelling of 12121997522112 in words is "twelve trillion, one hundred twenty-one billion, nine hundred ninety-seven million, five hundred twenty-two thousand, one hundred twelve".