1211212111120 has 80 divisors (see below), whose sum is σ = 3102491160000. Its totient is φ = 436079936000.

The previous prime is 1211212111111. The next prime is 1211212111129. The reversal of 1211212111120 is 211112121121.

It is an interprime number because it is at equal distance from previous prime (1211212111111) and next prime (1211212111129).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1211212111094 and 1211212111103.

It is not an unprimeable number, because it can be changed into a prime (1211212111129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6724870 + ... + 6902629.

It is an arithmetic number, because the mean of its divisors is an integer number (38781139500).

Almost surely, 2^{1211212111120} is an apocalyptic number.

1211212111120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211212111120 is an abundant number, since it is smaller than the sum of its proper divisors (1891279048880).

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

1211212111120 is a wasteful number, since it uses less digits than its factorization.

1211212111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13627624 (or 13627618 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1211212111120 its reverse (211112121121), we get a palindrome (1422324232241).

The spelling of 1211212111120 in words is "one trillion, two hundred eleven billion, two hundred twelve million, one hundred eleven thousand, one hundred twenty".