21144154 has 8 divisors (see below), whose sum is σ = 31742208. Its totient is φ = 10563420.

The previous prime is 21144121. The next prime is 21144173. The reversal of 21144154 is 45144112.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 652 + ... + 6535.

It is an arithmetic number, because the mean of its divisors is an integer number (3967776).

Almost surely, 2^21144154 is an apocalyptic number.

21144154 is a deficient number, since it is larger than the sum of its proper divisors (10598054).

21144154 is a wasteful number, since it uses less digits than its factorization.

21144154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8660.

The product of its digits is 640, while the sum is 22.

The square root of 21144154 is about 4598.2772861149. The cubic root of 21144154 is about 276.5222642839.

Adding to 21144154 its reverse (45144112), we get a palindrome (66288266).

The spelling of 21144154 in words is "twenty-one million, one hundred forty-four thousand, one hundred fifty-four".