2154021323 has 4 divisors (see below), whose sum is σ = 2247674448. Its totient is φ = 2060368200.

The previous prime is 2154021319. The next prime is 2154021349. The reversal of 2154021323 is 3231204512.

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

It is a cyclic number.

It is not a de Polignac number, because 2154021323 - 2² = 2154021319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 93653101 = 2154021323 / (2 + 1 + 5 + 4 + 0 + 2 + 1 + 3 + 2 + 3).

It is not an unprimeable number, because it can be changed into a prime (2154021523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46826528 + ... + 46826573.

It is an arithmetic number, because the mean of its divisors is an integer number (561918612).

Almost surely, 2^2154021323 is an apocalyptic number.

2154021323 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2154021323 is a deficient number, since it is larger than the sum of its proper divisors (93653125).

2154021323 is an equidigital number, since it uses as much as digits as its factorization.

2154021323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93653124.

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

The square root of 2154021323 is about 46411.4352611509. The cubic root of 2154021323 is about 1291.4670573897.

Adding to 2154021323 its reverse (3231204512), we get a palindrome (5385225835).

The spelling of 2154021323 in words is "two billion, one hundred fifty-four million, twenty-one thousand, three hundred twenty-three".