1211001223320 has 192 divisors, whose sum is σ = 4695719234400. Its totient is φ = 276800267520.

The previous prime is 1211001223303. The next prime is 1211001223373. The reversal of 1211001223320 is 233221001121.

1211001223320 is a `hidden beast` number, since 1 + 21 + 100 + 1 + 223 + 320 = 666.

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 = 1211001223293 and 1211001223302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11388891 + ... + 11494730.

Almost surely, 2^{1211001223320} is an apocalyptic number.

1211001223320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211001223320 is an abundant number, since it is smaller than the sum of its proper divisors (3484718011080).

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

1211001223320 is a wasteful number, since it uses less digits than its factorization.

1211001223320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22883655 (or 22883638 counting only the distinct ones).

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

Adding to 1211001223320 its reverse (233221001121), we get a palindrome (1444222224441).

The spelling of 1211001223320 in words is "one trillion, two hundred eleven billion, one million, two hundred twenty-three thousand, three hundred twenty".