1211222122220 has 24 divisors (see below), whose sum is σ = 2774799771408. Its totient is φ = 440444408000.

The previous prime is 1211222122207. The next prime is 1211222122289. The reversal of 1211222122220 is 222212221121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1211222122192 and 1211222122201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2752777331 + ... + 2752777770.

It is an arithmetic number, because the mean of its divisors is an integer number (115616657142).

Almost surely, 2^{1211222122220} is an apocalyptic number.

1211222122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211222122220 is an abundant number, since it is smaller than the sum of its proper divisors (1563577649188).

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

1211222122220 is a wasteful number, since it uses less digits than its factorization.

1211222122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505555121 (or 5505555119 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1211222122220 its reverse (222212221121), we get a palindrome (1433434343341).

The spelling of 1211222122220 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty".