2154233021 has 4 divisors (see below), whose sum is σ = 2165168412. Its totient is φ = 2143297632.

The previous prime is 2154232937. The next prime is 2154233023. The reversal of 2154233021 is 1203324512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1464592900 + 689640121 = 38270^2 + 26261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154233021 - 2¹⁸ = 2153970877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154233023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5467400 + ... + 5467793.

It is an arithmetic number, because the mean of its divisors is an integer number (541292103).

Almost surely, 2^2154233021 is an apocalyptic number.

It is an amenable number.

2154233021 is a deficient number, since it is larger than the sum of its proper divisors (10935391).

2154233021 is a wasteful number, since it uses less digits than its factorization.

2154233021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10935390.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 2154233021 is about 46413.7158714964. The cubic root of 2154233021 is about 1291.5093646213.

Adding to 2154233021 its reverse (1203324512), we get a palindrome (3357557533).

The spelling of 2154233021 in words is "two billion, one hundred fifty-four million, two hundred thirty-three thousand, twenty-one".