2121020112204 has 144 divisors (see below), whose sum is σ = 6630607646208. Its totient is φ = 579657627648.

The previous prime is 2121020112191. The next prime is 2121020112209. The reversal of 2121020112204 is 4022110201212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2121020112209) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6620277 + ... + 6933260.

It is an arithmetic number, because the mean of its divisors is an integer number (46045886432).

Almost surely, 2^{2121020112204} is an apocalyptic number.

It is an amenable number.

2121020112204 is an abundant number, since it is smaller than the sum of its proper divisors (4509587534004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121020112204 is a wasteful number, since it uses less digits than its factorization.

2121020112204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13553586 (or 13553572 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2121020112204 its reverse (4022110201212), we get a palindrome (6143130313416).

The spelling of 2121020112204 in words is "two trillion, one hundred twenty-one billion, twenty million, one hundred twelve thousand, two hundred four".