1211103220320 has 144 divisors (see below), whose sum is σ = 4723302598560. Its totient is φ = 276823590912.

The previous prime is 1211103220309. The next prime is 1211103220331. The reversal of 1211103220320 is 230223011121.

1211103220320 is a `hidden beast` number, since 1 + 2 + 11 + 10 + 322 + 0 + 320 = 666.

It is an interprime number because it is at equal distance from previous prime (1211103220309) and next prime (1211103220331).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1211103220293 and 1211103220302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60064485 + ... + 60084644.

It is an arithmetic number, because the mean of its divisors is an integer number (32800712490).

Almost surely, 2^{1211103220320} is an apocalyptic number.

1211103220320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211103220320 is an abundant number, since it is smaller than the sum of its proper divisors (3512199378240).

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

1211103220320 is a wasteful number, since it uses less digits than its factorization.

1211103220320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120149157 (or 120149146 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1211103220320 its reverse (230223011121), we get a palindrome (1441326231441).

The spelling of 1211103220320 in words is "one trillion, two hundred eleven billion, one hundred three million, two hundred twenty thousand, three hundred twenty".