2154215111 has 2 divisors, whose sum is σ = 2154215112. Its totient is φ = 2154215110.

The previous prime is 2154215099. The next prime is 2154215113. The reversal of 2154215111 is 1115124512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2154215111 - 2²⁶ = 2087106247 is a prime.

Together with 2154215113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154215113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077107555 + 1077107556.

It is an arithmetic number, because the mean of its divisors is an integer number (1077107556).

Almost surely, 2^2154215111 is an apocalyptic number.

2154215111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154215111 is an equidigital number, since it uses as much as digits as its factorization.

2154215111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 400, while the sum is 23.

The square root of 2154215111 is about 46413.5229324386. The cubic root of 2154215111 is about 1291.5057854670.

Adding to 2154215111 its reverse (1115124512), we get a palindrome (3269339623).

The spelling of 2154215111 in words is "two billion, one hundred fifty-four million, two hundred fifteen thousand, one hundred eleven".