21154323 has 8 divisors (see below), whose sum is σ = 28861888. Its totient is φ = 13774824.

The previous prime is 21154283. The next prime is 21154339. The reversal of 21154323 is 32345112.

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

It is not a de Polignac number, because 21154323 - 2¹⁰ = 21153299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21154323.

It is not an unprimeable number, because it can be changed into a prime (21154123) 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, 81865 + ... + 82122.

It is an arithmetic number, because the mean of its divisors is an integer number (3607736).

Almost surely, 2^21154323 is an apocalyptic number.

21154323 is a deficient number, since it is larger than the sum of its proper divisors (7707565).

21154323 is a wasteful number, since it uses less digits than its factorization.

21154323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164033.

The product of its digits is 720, while the sum is 21.

The square root of 21154323 is about 4599.3828933891. The cubic root of 21154323 is about 276.5665870825.

Adding to 21154323 its reverse (32345112), we get a palindrome (53499435).

The spelling of 21154323 in words is "twenty-one million, one hundred fifty-four thousand, three hundred twenty-three".