2121021200101 has 4 divisors (see below), whose sum is σ = 2123115002892. Its totient is φ = 2118927397312.

The previous prime is 2121021200087. The next prime is 2121021200119. The reversal of 2121021200101 is 1010021201212.

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 345478275076 + 1775542925025 = 587774^2 + 1332495^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121021200101 - 2²⁹ = 2120484329189 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 (2121021207101) 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, 1046899876 + ... + 1046901901.

It is an arithmetic number, because the mean of its divisors is an integer number (530778750723).

Almost surely, 2^{2121021200101} is an apocalyptic number.

It is an amenable number.

2121021200101 is a deficient number, since it is larger than the sum of its proper divisors (2093802791).

2121021200101 is a wasteful number, since it uses less digits than its factorization.

2121021200101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093802790.

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

Adding to 2121021200101 its reverse (1010021201212), we get a palindrome (3131042401313).

The spelling of 2121021200101 in words is "two trillion, one hundred twenty-one billion, twenty-one million, two hundred thousand, one hundred one".