20111001100121 has 4 divisors (see below), whose sum is σ = 21294001164852. Its totient is φ = 18928001035392.

The previous prime is 20111001100111. The next prime is 20111001100199. The reversal of 20111001100121 is 12100110011102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16666487816521 + 3444513283600 = 4082461^2 + 1855940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111001100121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111001100111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591500032340 + ... + 591500032373.

It is an arithmetic number, because the mean of its divisors is an integer number (5323500291213).

Almost surely, 2^{20111001100121} is an apocalyptic number.

It is an amenable number.

20111001100121 is a deficient number, since it is larger than the sum of its proper divisors (1183000064731).

20111001100121 is a wasteful number, since it uses less digits than its factorization.

20111001100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183000064730.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20111001100121 its reverse (12100110011102), we get a palindrome (32211111111223).

The spelling of 20111001100121 in words is "twenty trillion, one hundred eleven billion, one million, one hundred thousand, one hundred twenty-one".