2111554511221 has 8 divisors (see below), whose sum is σ = 2222705422080. Its totient is φ = 2000405246688.

The previous prime is 2111554511219. The next prime is 2111554511251. The reversal of 2111554511221 is 1221154551112.

It is a happy number.

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 2111554511221 - 2¹ = 2111554511219 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 (2111554511251) 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 7 ways as a sum of consecutive naturals, for example, 2907465 + ... + 3560401.

It is an arithmetic number, because the mean of its divisors is an integer number (277838177760).

Almost surely, 2^{2111554511221} is an apocalyptic number.

It is an amenable number.

2111554511221 is a deficient number, since it is larger than the sum of its proper divisors (111150910859).

2111554511221 is a wasteful number, since it uses less digits than its factorization.

2111554511221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823163.

The product of its digits is 4000, while the sum is 31.

The spelling of 2111554511221 in words is "two trillion, one hundred eleven billion, five hundred fifty-four million, five hundred eleven thousand, two hundred twenty-one".