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21452031 = 3223313343
BaseRepresentation
bin101000111010…
…1010011111111
31111100212122200
41101311103333
520442431111
62043442543
7350224236
oct121652377
944325580
1021452031
1111122257
127226453
1345a1313
142bc5b1d
151d3b256
hex14754ff

21452031 has 24 divisors (see below), whose sum is σ = 33386496. Its totient is φ = 13234320.

The previous prime is 21452029. The next prime is 21452051. The reversal of 21452031 is 13025412.

It is not a de Polignac number, because 21452031 - 21 = 21452029 is a prime.

It is a super-2 number, since 2×214520312 = 920379268049922, which contains 22 as substring.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 21451995 and 21452013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4746 + ... + 8088.

It is an arithmetic number, because the mean of its divisors is an integer number (1391104).

Almost surely, 221452031 is an apocalyptic number.

21452031 is a deficient number, since it is larger than the sum of its proper divisors (11934465).

21452031 is a wasteful number, since it uses less digits than its factorization.

21452031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3403 (or 3400 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21452031 is about 4631.6337290421. The cubic root of 21452031 is about 277.8579359718.

Adding to 21452031 its reverse (13025412), we get a palindrome (34477443).

The spelling of 21452031 in words is "twenty-one million, four hundred fifty-two thousand, thirty-one".

Divisors: 1 3 9 23 31 69 93 207 279 713 2139 3343 6417 10029 30087 76889 103633 230667 310899 692001 932697 2383559 7150677 21452031