2154423021 has 16 divisors (see below), whose sum is σ = 3001052160. Its totient is φ = 1373019200.

The previous prime is 2154423001. The next prime is 2154423031. The reversal of 2154423021 is 1203244512.

It is a cyclic number.

It is not a de Polignac number, because 2154423021 - 2⁶ = 2154422957 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2154422982 and 2154423000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154423001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113805 + ... + 131378.

It is an arithmetic number, because the mean of its divisors is an integer number (187565760).

Almost surely, 2^2154423021 is an apocalyptic number.

It is an amenable number.

2154423021 is a deficient number, since it is larger than the sum of its proper divisors (846629139).

2154423021 is a wasteful number, since it uses less digits than its factorization.

2154423021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245316.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 2154423021 is about 46415.7626351221. The cubic root of 2154423021 is about 1291.5473332104.

Adding to 2154423021 its reverse (1203244512), we get a palindrome (3357667533).

The spelling of 2154423021 in words is "two billion, one hundred fifty-four million, four hundred twenty-three thousand, twenty-one".