1200122122221 has 48 divisors (see below), whose sum is σ = 1975131587520. Its totient is φ = 695693871360.

The previous prime is 1200122122189. The next prime is 1200122122223. The reversal of 1200122122221 is 1222212210021.

It is a happy number.

1200122122221 is a `hidden beast` number, since 1 + 200 + 1 + 221 + 22 + 221 = 666.

It is not a de Polignac number, because 1200122122221 - 2⁵ = 1200122122189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200122122194 and 1200122122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200122122223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2560440 + ... + 2992673.

It is an arithmetic number, because the mean of its divisors is an integer number (41148574740).

Almost surely, 2^{1200122122221} is an apocalyptic number.

1200122122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200122122221 is a deficient number, since it is larger than the sum of its proper divisors (775009465299).

1200122122221 is a wasteful number, since it uses less digits than its factorization.

1200122122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5553226 (or 5553223 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1200122122221 its reverse (1222212210021), we get a palindrome (2422334332242).

The spelling of 1200122122221 in words is "one trillion, two hundred billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".