20121101121001 has 4 divisors (see below), whose sum is σ = 20121110572932. Its totient is φ = 20121091669072.

The previous prime is 20121101120999. The next prime is 20121101121067. The reversal of 20121101121001 is 10012110112102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14371104773776 + 5749996347225 = 3790924^2 + 2397915^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121101121001 - 2¹ = 20121101120999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121101121301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131235 + ... + 6345031.

It is an arithmetic number, because the mean of its divisors is an integer number (5030277643233).

Almost surely, 2^{20121101121001} is an apocalyptic number.

It is an amenable number.

20121101121001 is a deficient number, since it is larger than the sum of its proper divisors (9451931).

20121101121001 is an equidigital number, since it uses as much as digits as its factorization.

20121101121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9451930.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20121101121001 its reverse (10012110112102), we get a palindrome (30133211233103).

The spelling of 20121101121001 in words is "twenty trillion, one hundred twenty-one billion, one hundred one million, one hundred twenty-one thousand, one".