1211111001012 has 48 divisors (see below), whose sum is σ = 3216864010752. Its totient is φ = 351046666080.

The previous prime is 1211111000923. The next prime is 1211111001101. The reversal of 1211111001012 is 2101001111121.

It is an interprime number because it is at equal distance from previous prime (1211111000923) and next prime (1211111001101).

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

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, 199455298 + ... + 199461369.

It is an arithmetic number, because the mean of its divisors is an integer number (67018000224).

Almost surely, 2^{1211111001012} is an apocalyptic number.

1211111001012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211111001012 is an abundant number, since it is smaller than the sum of its proper divisors (2005753009740).

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

1211111001012 is a wasteful number, since it uses less digits than its factorization.

1211111001012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398916708 (or 398916706 counting only the distinct ones).

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

Adding to 1211111001012 its reverse (2101001111121), we get a palindrome (3312112112133).

The spelling of 1211111001012 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one thousand, twelve".