21124741 has 8 divisors (see below), whose sum is σ = 24047424. Its totient is φ = 18369120.

The previous prime is 21124711. The next prime is 21124759. The reversal of 21124741 is 14742112.

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

It is not a de Polignac number, because 21124741 - 2⁵ = 21124709 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 (21124711) 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, 41496 + ... + 42001.

It is an arithmetic number, because the mean of its divisors is an integer number (3005928).

Almost surely, 2^21124741 is an apocalyptic number.

It is an amenable number.

21124741 is a deficient number, since it is larger than the sum of its proper divisors (2922683).

21124741 is a wasteful number, since it uses less digits than its factorization.

21124741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83531.

The product of its digits is 448, while the sum is 22.

The square root of 21124741 is about 4596.1659021406. The cubic root of 21124741 is about 276.4376109336.

Adding to 21124741 its reverse (14742112), we get a palindrome (35866853).

The spelling of 21124741 in words is "twenty-one million, one hundred twenty-four thousand, seven hundred forty-one".