21124154 has 8 divisors (see below), whose sum is σ = 31982688. Its totient is φ = 10463260.

The previous prime is 21124141. The next prime is 21124163. The reversal of 21124154 is 45142112.

It is a happy number.

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, 49142 + ... + 49569.

It is an arithmetic number, because the mean of its divisors is an integer number (3997836).

Almost surely, 2^21124154 is an apocalyptic number.

21124154 is a deficient number, since it is larger than the sum of its proper divisors (10858534).

21124154 is a wasteful number, since it uses less digits than its factorization.

21124154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98820.

The product of its digits is 320, while the sum is 20.

The square root of 21124154 is about 4596.1020441239. The cubic root of 21124154 is about 276.4350504229.

Adding to 21124154 its reverse (45142112), we get a palindrome (66266266).

The spelling of 21124154 in words is "twenty-one million, one hundred twenty-four thousand, one hundred fifty-four".