2121666335155 has 8 divisors (see below), whose sum is σ = 2546013733200. Its totient is φ = 1697323647456.

The previous prime is 2121666335137. The next prime is 2121666335179. The reversal of 2121666335155 is 5515336661212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121666335155 - 2²¹ = 2121664238003 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96400 + ... + 2062189.

It is an arithmetic number, because the mean of its divisors is an integer number (318251716650).

Almost surely, 2^{2121666335155} is an apocalyptic number.

2121666335155 is a deficient number, since it is larger than the sum of its proper divisors (424347398045).

2121666335155 is a wasteful number, since it uses less digits than its factorization.

2121666335155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355173.

The product of its digits is 972000, while the sum is 46.

The spelling of 2121666335155 in words is "two trillion, one hundred twenty-one billion, six hundred sixty-six million, three hundred thirty-five thousand, one hundred fifty-five".