2121116235551 has 4 divisors (see below), whose sum is σ = 2121121938600. Its totient is φ = 2121110532504.

The previous prime is 2121116235541. The next prime is 2121116235593. The reversal of 2121116235551 is 1555326111212.

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 2121116235551 - 2¹⁰ = 2121116234527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121116235541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2251556 + ... + 3051513.

It is an arithmetic number, because the mean of its divisors is an integer number (530280484650).

Almost surely, 2^{2121116235551} is an apocalyptic number.

2121116235551 is a deficient number, since it is larger than the sum of its proper divisors (5703049).

2121116235551 is an equidigital number, since it uses as much as digits as its factorization.

2121116235551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5703048.

The product of its digits is 18000, while the sum is 35.

The spelling of 2121116235551 in words is "two trillion, one hundred twenty-one billion, one hundred sixteen million, two hundred thirty-five thousand, five hundred fifty-one".