1211111002220 has 96 divisors (see below), whose sum is σ = 3093594311808. Its totient is φ = 388787208192.

The previous prime is 1211111002207. The next prime is 1211111002223. The reversal of 1211111002220 is 222001111121.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1211111002195 and 1211111002204.

It is not an unprimeable number, because it can be changed into a prime (1211111002223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 858977 + ... + 1777656.

It is an arithmetic number, because the mean of its divisors is an integer number (32224940748).

Almost surely, 2^{1211111002220} is an apocalyptic number.

1211111002220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211111002220 is an abundant number, since it is smaller than the sum of its proper divisors (1882483309588).

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

1211111002220 is a wasteful number, since it uses less digits than its factorization.

1211111002220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636859 (or 2636857 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211111002220 its reverse (222001111121), we get a palindrome (1433112113341).

The spelling of 1211111002220 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two thousand, two hundred twenty".