2154221919 has 32 divisors (see below), whose sum is σ = 3363494400. Its totient is φ = 1358907840.

The previous prime is 2154221911. The next prime is 2154221921. The reversal of 2154221919 is 9191224512.

2154221919 is a `hidden beast` number, since 2 + 1 + 542 + 21 + 91 + 9 = 666.

It is not a de Polignac number, because 2154221919 - 2³ = 2154221911 is a prime.

It is a super-2 number, since 2×2154221919² = 9281344152600085122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154221911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 526867 + ... + 530939.

It is an arithmetic number, because the mean of its divisors is an integer number (105109200).

Almost surely, 2^2154221919 is an apocalyptic number.

2154221919 is a deficient number, since it is larger than the sum of its proper divisors (1209272481).

2154221919 is a wasteful number, since it uses less digits than its factorization.

2154221919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132 (or 5126 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 2154221919 is about 46413.5962730750. The cubic root of 2154221919 is about 1291.5071459876.

The spelling of 2154221919 in words is "two billion, one hundred fifty-four million, two hundred twenty-one thousand, nine hundred nineteen".