2121121221104 has 20 divisors (see below), whose sum is σ = 4109699410320. Its totient is φ = 1060553631360.

The previous prime is 2121121221103. The next prime is 2121121221151. The reversal of 2121121221104 is 4011221211212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121121221103) 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, 2797652 + ... + 3474060.

It is an arithmetic number, because the mean of its divisors is an integer number (205484970516).

Almost surely, 2^{2121121221104} is an apocalyptic number.

It is an amenable number.

2121121221104 is a deficient number, since it is larger than the sum of its proper divisors (1988578189216).

2121121221104 is a wasteful number, since it uses less digits than its factorization.

2121121221104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872408 (or 872402 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 2121121221104 its reverse (4011221211212), we get a palindrome (6132342432316).

The spelling of 2121121221104 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred four".