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21553069 = 61353329
BaseRepresentation
bin101001000110…
…1111110101101
31111120000020211
41102031332231
521004144234
62045542421
7351124636
oct122157655
944500224
1021553069
111119115a
127274a11
1346082c5
142c1088d
151d5b164
hex148dfad

21553069 has 4 divisors (see below), whose sum is σ = 21906460. Its totient is φ = 21199680.

The previous prime is 21553057. The next prime is 21553079. The reversal of 21553069 is 96035512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1077444 + 20475625 = 1038^2 + 4525^2 .

It is a cyclic number.

It is not a de Polignac number, because 21553069 - 213 = 21544877 is a prime.

It is a super-2 number, since 2×215530692 = 929069566637522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21553069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21553009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176604 + ... + 176725.

It is an arithmetic number, because the mean of its divisors is an integer number (5476615).

Almost surely, 221553069 is an apocalyptic number.

It is an amenable number.

21553069 is a deficient number, since it is larger than the sum of its proper divisors (353391).

21553069 is an equidigital number, since it uses as much as digits as its factorization.

21553069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353390.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 21553069 is about 4642.5282982444. The cubic root of 21553069 is about 278.2934852376.

The spelling of 21553069 in words is "twenty-one million, five hundred fifty-three thousand, sixty-nine".

Divisors: 1 61 353329 21553069