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11421821 = 41278581
BaseRepresentation
bin101011100100…
…100001111101
3210111021210102
4223210201331
510410444241
61044450445
7166040525
oct53444175
923437712
1011421821
1164a1424
1239a9a25
13249ba98
141734685
15100939b
hexae487d

11421821 has 4 divisors (see below), whose sum is σ = 11700444. Its totient is φ = 11143200.

The previous prime is 11421803. The next prime is 11421859. The reversal of 11421821 is 12812411.

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 1092025 + 10329796 = 1045^2 + 3214^2 .

It is a cyclic number.

It is not a de Polignac number, because 11421821 - 26 = 11421757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11421793 and 11421802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11421121) 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 3 ways as a sum of consecutive naturals, for example, 139250 + ... + 139331.

It is an arithmetic number, because the mean of its divisors is an integer number (2925111).

Almost surely, 211421821 is an apocalyptic number.

It is an amenable number.

11421821 is a deficient number, since it is larger than the sum of its proper divisors (278623).

11421821 is an equidigital number, since it uses as much as digits as its factorization.

11421821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278622.

The product of its digits is 128, while the sum is 20.

The square root of 11421821 is about 3379.6184695909. The cubic root of 11421821 is about 225.2052185282.

The spelling of 11421821 in words is "eleven million, four hundred twenty-one thousand, eight hundred twenty-one".

Divisors: 1 41 278581 11421821