2154121411 has 4 divisors (see below), whose sum is σ = 2319823072. Its totient is φ = 1988419752.

The previous prime is 2154121399. The next prime is 2154121423. The reversal of 2154121411 is 1141214512.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (2154121399) and next prime (2154121423).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154121411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2154121451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82850811 + ... + 82850836.

It is an arithmetic number, because the mean of its divisors is an integer number (579955768).

Almost surely, 2^2154121411 is an apocalyptic number.

2154121411 is a deficient number, since it is larger than the sum of its proper divisors (165701661).

2154121411 is a wasteful number, since it uses less digits than its factorization.

2154121411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165701660.

The product of its digits is 320, while the sum is 22.

The square root of 2154121411 is about 46412.5135173694. The cubic root of 2154121411 is about 1291.4870600318.

Adding to 2154121411 its reverse (1141214512), we get a palindrome (3295335923).

The spelling of 2154121411 in words is "two billion, one hundred fifty-four million, one hundred twenty-one thousand, four hundred eleven".