2121121221004 has 12 divisors (see below), whose sum is σ = 3736544668528. Its totient is φ = 1053537030000.

The previous prime is 2121121220987. The next prime is 2121121221047. The reversal of 2121121221004 is 4001221211212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1755894447 + ... + 1755895654.

Almost surely, 2^{2121121221004} is an apocalyptic number.

It is an amenable number.

2121121221004 is a deficient number, since it is larger than the sum of its proper divisors (1615423447524).

2121121221004 is a wasteful number, since it uses less digits than its factorization.

2121121221004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3511790256 (or 3511790254 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2121121221004 its reverse (4001221211212), we get a palindrome (6122342432216).

The spelling of 2121121221004 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, four".