1200121055 has 8 divisors (see below), whose sum is σ = 1645880352. Its totient is φ = 822940128.

The previous prime is 1200121019. The next prime is 1200121057. The reversal of 1200121055 is 5501210021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1200121055 - 2¹⁴ = 1200104671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17144552 + ... + 17144621.

It is an arithmetic number, because the mean of its divisors is an integer number (205735044).

Almost surely, 2^1200121055 is an apocalyptic number.

1200121055 is a deficient number, since it is larger than the sum of its proper divisors (445759297).

1200121055 is an equidigital number, since it uses as much as digits as its factorization.

1200121055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34289185.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 1200121055 is about 34642.7633857347. The cubic root of 1200121055 is about 1062.6943013514.

Adding to 1200121055 its reverse (5501210021), we get a palindrome (6701331076).

The spelling of 1200121055 in words is "one billion, two hundred million, one hundred twenty-one thousand, fifty-five".