20121200235555 has 32 divisors (see below), whose sum is σ = 32985078251328. Its totient is φ = 10467681792000.

The previous prime is 20121200235529. The next prime is 20121200235559. The reversal of 20121200235555 is 55553200212102.

It is not a de Polignac number, because 20121200235555 - 2⁹ = 20121200235043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121200235559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 473755 + ... + 6361355.

It is an arithmetic number, because the mean of its divisors is an integer number (1030783695354).

Almost surely, 2^{20121200235555} is an apocalyptic number.

20121200235555 is a deficient number, since it is larger than the sum of its proper divisors (12863878015773).

20121200235555 is a wasteful number, since it uses less digits than its factorization.

20121200235555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5893207.

The product of its (nonzero) digits is 30000, while the sum is 33.

Adding to 20121200235555 its reverse (55553200212102), we get a palindrome (75674400447657).

The spelling of 20121200235555 in words is "twenty trillion, one hundred twenty-one billion, two hundred million, two hundred thirty-five thousand, five hundred fifty-five".