2121605155211 has 4 divisors (see below), whose sum is σ = 2141069422800. Its totient is φ = 2102140887624.

The previous prime is 2121605155193. The next prime is 2121605155273. The reversal of 2121605155211 is 1125515061212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121605155211 - 2⁶ = 2121605155147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121605152211) by changing a digit.

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, 9732133631 + ... + 9732133848.

It is an arithmetic number, because the mean of its divisors is an integer number (535267355700).

Almost surely, 2^{2121605155211} is an apocalyptic number.

2121605155211 is a deficient number, since it is larger than the sum of its proper divisors (19464267589).

2121605155211 is a wasteful number, since it uses less digits than its factorization.

2121605155211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19464267588.

The product of its (nonzero) digits is 6000, while the sum is 32.

The spelling of 2121605155211 in words is "two trillion, one hundred twenty-one billion, six hundred five million, one hundred fifty-five thousand, two hundred eleven".