2121210212101 has 4 divisors (see below), whose sum is σ = 2123089053100. Its totient is φ = 2119331371104.

The previous prime is 2121210212089. The next prime is 2121210212129. The reversal of 2121210212101 is 1012120121212.

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 673098821476 + 1448111390625 = 820426^2 + 1203375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121210212101 is a prime.

It is a super-3 number, since 3×2121210212101³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121210242101) 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, 939418806 + ... + 939421063.

It is an arithmetic number, because the mean of its divisors is an integer number (530772263275).

Almost surely, 2^{2121210212101} is an apocalyptic number.

It is an amenable number.

2121210212101 is a deficient number, since it is larger than the sum of its proper divisors (1878840999).

2121210212101 is a wasteful number, since it uses less digits than its factorization.

2121210212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878840998.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2121210212101 its reverse (1012120121212), we get a palindrome (3133330333313).

The spelling of 2121210212101 in words is "two trillion, one hundred twenty-one billion, two hundred ten million, two hundred twelve thousand, one hundred one".