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21561364 = 2211490031
BaseRepresentation
bin101001001000…
…0000000010100
31111120102122001
41102100000110
521004430424
62050045044
7351161056
oct122200024
944512561
1021561364
1111197410
127279784
13460c006
142c138d6
151d5d844
hex1490014

21561364 has 12 divisors (see below), whose sum is σ = 41162688. Its totient is φ = 9800600.

The previous prime is 21561359. The next prime is 21561377. The reversal of 21561364 is 46316512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244972 + ... + 245059.

It is an arithmetic number, because the mean of its divisors is an integer number (3430224).

Almost surely, 221561364 is an apocalyptic number.

It is an amenable number.

21561364 is a deficient number, since it is larger than the sum of its proper divisors (19601324).

21561364 is a wasteful number, since it uses less digits than its factorization.

21561364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490046 (or 490044 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 21561364 is about 4643.4215832724. The cubic root of 21561364 is about 278.3291823716.

Adding to 21561364 its reverse (46316512), we get a palindrome (67877876).

The spelling of 21561364 in words is "twenty-one million, five hundred sixty-one thousand, three hundred sixty-four".

Divisors: 1 2 4 11 22 44 490031 980062 1960124 5390341 10780682 21561364