20121100212745 has 64 divisors (see below), whose sum is σ = 29154901800960. Its totient is φ = 13022650713600.

The previous prime is 20121100212743. The next prime is 20121100212757. The reversal of 20121100212745 is 54721200112102.

It is not a de Polignac number, because 20121100212745 - 2¹ = 20121100212743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121100212743) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 325959454 + ... + 326021176.

It is an arithmetic number, because the mean of its divisors is an integer number (455545340640).

Almost surely, 2^{20121100212745} is an apocalyptic number.

It is an amenable number.

20121100212745 is a deficient number, since it is larger than the sum of its proper divisors (9033801588215).

20121100212745 is a wasteful number, since it uses less digits than its factorization.

20121100212745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63566.

The product of its (nonzero) digits is 2240, while the sum is 28.

Adding to 20121100212745 its reverse (54721200112102), we get a palindrome (74842300324847).

The spelling of 20121100212745 in words is "twenty trillion, one hundred twenty-one billion, one hundred million, two hundred twelve thousand, seven hundred forty-five".