2102120020121 has 4 divisors (see below), whose sum is σ = 2293221840144. Its totient is φ = 1911018200100.

The previous prime is 2102120020109. The next prime is 2102120020193. The reversal of 2102120020121 is 1210200212012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2102120020121 - 2¹⁸ = 2102119757977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2102120020096 and 2102120020105.

It is not an unprimeable number, because it can be changed into a prime (2102120020321) 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, 95550909995 + ... + 95550910016.

It is an arithmetic number, because the mean of its divisors is an integer number (573305460036).

Almost surely, 2^{2102120020121} is an apocalyptic number.

It is an amenable number.

2102120020121 is a deficient number, since it is larger than the sum of its proper divisors (191101820023).

2102120020121 is a wasteful number, since it uses less digits than its factorization.

2102120020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191101820022.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2102120020121 its reverse (1210200212012), we get a palindrome (3312320232133).

The spelling of 2102120020121 in words is "two trillion, one hundred two billion, one hundred twenty million, twenty thousand, one hundred twenty-one".