1213012121112 has 128 divisors (see below), whose sum is σ = 3677449248000. Its totient is φ = 367413937920.

The previous prime is 1213012121081. The next prime is 1213012121117. The reversal of 1213012121112 is 2111212103121.

It is a happy number.

1213012121112 is a `hidden beast` number, since 121 + 301 + 21 + 211 + 12 = 666.

It is a super-2 number, since 2×1213012121112² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213012121117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5215564 + ... + 5443172.

It is an arithmetic number, because the mean of its divisors is an integer number (28730072250).

Almost surely, 2^{1213012121112} is an apocalyptic number.

1213012121112 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 1213012121112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1838724624000).

1213012121112 is an abundant number, since it is smaller than the sum of its proper divisors (2464437126888).

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

1213012121112 is a wasteful number, since it uses less digits than its factorization.

1213012121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229878 (or 229868 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1213012121112 its reverse (2111212103121), we get a palindrome (3324224224233).

The spelling of 1213012121112 in words is "one trillion, two hundred thirteen billion, twelve million, one hundred twenty-one thousand, one hundred twelve".