2121101120121 has 16 divisors (see below), whose sum is σ = 3000424857600. Its totient is φ = 1329094439568.

The previous prime is 2121101120111. The next prime is 2121101120143. The reversal of 2121101120121 is 1210211011212.

It is a happy number.

It is not a de Polignac number, because 2121101120121 - 2³¹ = 2118953636473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121101120121.

It is not an unprimeable number, because it can be changed into a prime (2121101120111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146497881 + ... + 146512358.

It is an arithmetic number, because the mean of its divisors is an integer number (187526553600).

Almost surely, 2^{2121101120121} is an apocalyptic number.

It is an amenable number.

2121101120121 is a deficient number, since it is larger than the sum of its proper divisors (879323737479).

2121101120121 is a wasteful number, since it uses less digits than its factorization.

2121101120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293010388.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2121101120121 its reverse (1210211011212), we get a palindrome (3331312131333).

The spelling of 2121101120121 in words is "two trillion, one hundred twenty-one billion, one hundred one million, one hundred twenty thousand, one hundred twenty-one".