2154888921 has 8 divisors (see below), whose sum is σ = 2880011584. Its totient is φ = 1433179440.

The previous prime is 2154888913. The next prime is 2154888959. The reversal of 2154888921 is 1298884512.

2154888921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2154888921 - 2³ = 2154888913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2154881921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 851821 + ... + 854346.

It is an arithmetic number, because the mean of its divisors is an integer number (360001448).

Almost surely, 2^2154888921 is an apocalyptic number.

It is an amenable number.

2154888921 is a deficient number, since it is larger than the sum of its proper divisors (725122663).

2154888921 is a wasteful number, since it uses less digits than its factorization.

2154888921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706591.

The product of its digits is 368640, while the sum is 48.

The square root of 2154888921 is about 46420.7811330227. The cubic root of 2154888921 is about 1291.6404267404.

The spelling of 2154888921 in words is "two billion, one hundred fifty-four million, eight hundred eighty-eight thousand, nine hundred twenty-one".