1211110120 has 32 divisors (see below), whose sum is σ = 2972725920. Its totient is φ = 440403520.

The previous prime is 1211110091. The next prime is 1211110129. The reversal of 1211110120 is 210111121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1211110097 and 1211110106.

It is not an unprimeable number, because it can be changed into a prime (1211110129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1375822 + ... + 1376701.

It is an arithmetic number, because the mean of its divisors is an integer number (92897685).

Almost surely, 2^1211110120 is an apocalyptic number.

1211110120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211110120 is an abundant number, since it is smaller than the sum of its proper divisors (1761615800).

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

1211110120 is a wasteful number, since it uses less digits than its factorization.

1211110120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2752545 (or 2752541 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1211110120 is about 34801.0074566815. The cubic root of 1211110120 is about 1065.9280176958.

Adding to 1211110120 its reverse (210111121), we get a palindrome (1421221241).

It can be divided in two parts, 12111101 and 20, that added together give a palindrome (12111121).

The spelling of 1211110120 in words is "one billion, two hundred eleven million, one hundred ten thousand, one hundred twenty".