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24220021 = 731239467
BaseRepresentation
bin101110001100…
…1000101110101
31200120111121211
41130121011311
522200020041
62223041421
7412603210
oct134310565
950514554
1024220021
1112742951
128140271
135030197
143306777
1521d6481
hex1719175

24220021 has 16 divisors (see below), whose sum is σ = 28753920. Its totient is φ = 19963440.

The previous prime is 24219997. The next prime is 24220037. The reversal of 24220021 is 12002242.

It is not a de Polignac number, because 24220021 - 27 = 24219893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 24219983 and 24220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24220061) 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 15 ways as a sum of consecutive naturals, for example, 51630 + ... + 52096.

It is an arithmetic number, because the mean of its divisors is an integer number (1797120).

Almost surely, 224220021 is an apocalyptic number.

It is an amenable number.

24220021 is a deficient number, since it is larger than the sum of its proper divisors (4533899).

24220021 is a wasteful number, since it uses less digits than its factorization.

24220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 24220021 is about 4921.3840532923. The cubic root of 24220021 is about 289.3286929619.

Adding to 24220021 its reverse (12002242), we get a palindrome (36222263).

The spelling of 24220021 in words is "twenty-four million, two hundred twenty thousand, twenty-one".