2102012202121 has 4 divisors (see below), whose sum is σ = 2263705448452. Its totient is φ = 1940318955792.

The previous prime is 2102012202119. The next prime is 2102012202131. The reversal of 2102012202121 is 1212022102012.

It is a happy number.

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 662465766400 + 1439546435721 = 813920^2 + 1199811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102012202121 - 2¹ = 2102012202119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102012202095 and 2102012202104.

It is not an unprimeable number, because it can be changed into a prime (2102012202131) 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, 80846623146 + ... + 80846623171.

It is an arithmetic number, because the mean of its divisors is an integer number (565926362113).

Almost surely, 2^{2102012202121} is an apocalyptic number.

It is an amenable number.

2102012202121 is a deficient number, since it is larger than the sum of its proper divisors (161693246331).

2102012202121 is a wasteful number, since it uses less digits than its factorization.

2102012202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161693246330.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2102012202121 its reverse (1212022102012), we get a palindrome (3314034304133).

The spelling of 2102012202121 in words is "two trillion, one hundred two billion, twelve million, two hundred two thousand, one hundred twenty-one".