2129128506004 has 12 divisors (see below), whose sum is σ = 3726002595700. Its totient is φ = 1064556335808.

The previous prime is 2129128505983. The next prime is 2129128506023. The reversal of 2129128506004 is 4006058219212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 287190953604 + 1841937552400 = 535902^2 + 1357180^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1352139 + ... + 2467090.

Almost surely, 2^{2129128506004} is an apocalyptic number.

It is an amenable number.

2129128506004 is a deficient number, since it is larger than the sum of its proper divisors (1596874089696).

2129128506004 is a wasteful number, since it uses less digits than its factorization.

2129128506004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958602 (or 3958600 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 2129128506004 in words is "two trillion, one hundred twenty-nine billion, one hundred twenty-eight million, five hundred six thousand, four".