121200150553 has 16 divisors (see below), whose sum is σ = 124536741840. Its totient is φ = 117882265600.

The previous prime is 121200150541. The next prime is 121200150593. The reversal of 121200150553 is 355051002121.

It can be written as a sum of positive squares in 8 ways, for example, as 17807034249 + 103393116304 = 133443^2 + 321548^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200150553 - 2¹⁷ = 121200019481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121200150593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20549901 + ... + 20555797.

It is an arithmetic number, because the mean of its divisors is an integer number (7783546365).

Almost surely, 2^121200150553 is an apocalyptic number.

It is an amenable number.

121200150553 is a deficient number, since it is larger than the sum of its proper divisors (3336591287).

121200150553 is an equidigital number, since it uses as much as digits as its factorization.

121200150553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7388.

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 121200150553 its reverse (355051002121), we get a palindrome (476251152674).

The spelling of 121200150553 in words is "one hundred twenty-one billion, two hundred million, one hundred fifty thousand, five hundred fifty-three".