1011111001212 has 144 divisors (see below), whose sum is σ = 2628903918816. Its totient is φ = 300498432000.

The previous prime is 1011111001211. The next prime is 1011111001213. The reversal of 1011111001212 is 2121001111101.

It is an interprime number because it is at equal distance from previous prime (1011111001211) and next prime (1011111001213).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011111001211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65237848 + ... + 65253344.

It is an arithmetic number, because the mean of its divisors is an integer number (18256277214).

Almost surely, 2^{1011111001212} is an apocalyptic number.

1011111001212 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 1011111001212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1314451959408).

1011111001212 is an abundant number, since it is smaller than the sum of its proper divisors (1617792917604).

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

1011111001212 is a wasteful number, since it uses less digits than its factorization.

1011111001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15760 (or 15657 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1011111001212 its reverse (2121001111101), we get a palindrome (3132112112313).

The spelling of 1011111001212 in words is "one trillion, eleven billion, one hundred eleven million, one thousand, two hundred twelve".