2121012200101 has 4 divisors (see below), whose sum is σ = 2124220993804. Its totient is φ = 2117803406400.

The previous prime is 2121012200053. The next prime is 2121012200107. The reversal of 2121012200101 is 1010022101212.

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 1738007172225 + 383005027876 = 1318335^2 + 618874^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121012200101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121012200107) 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, 1604395860 + ... + 1604397181.

It is an arithmetic number, because the mean of its divisors is an integer number (531055248451).

Almost surely, 2^{2121012200101} is an apocalyptic number.

It is an amenable number.

2121012200101 is a deficient number, since it is larger than the sum of its proper divisors (3208793703).

2121012200101 is an equidigital number, since it uses as much as digits as its factorization.

2121012200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3208793702.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2121012200101 its reverse (1010022101212), we get a palindrome (3131034301313).

The spelling of 2121012200101 in words is "two trillion, one hundred twenty-one billion, twelve million, two hundred thousand, one hundred one".