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21821132 = 2217320899
BaseRepresentation
bin101001100111…
…1011011001100
31112001121222002
41103033123030
521041234012
62055411432
7353322314
oct123173314
945047862
1021821132
11113545a3
127383b78
1346a0318
142c80444
151db07c2
hex14cf6cc

21821132 has 12 divisors (see below), whose sum is σ = 40433400. Its totient is φ = 10268736.

The previous prime is 21821123. The next prime is 21821141. The reversal of 21821132 is 23112812.

It is an interprime number because it is at equal distance from previous prime (21821123) and next prime (21821141).

It is a super-2 number, since 2×218211322 = 952323603522848, which contains 22 as substring.

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, 160382 + ... + 160517.

It is an arithmetic number, because the mean of its divisors is an integer number (3369450).

Almost surely, 221821132 is an apocalyptic number.

It is an amenable number.

21821132 is a deficient number, since it is larger than the sum of its proper divisors (18612268).

21821132 is a wasteful number, since it uses less digits than its factorization.

21821132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320920 (or 320918 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 21821132 is about 4671.3094523913. The cubic root of 21821132 is about 279.4424790665.

Adding to 21821132 its reverse (23112812), we get a palindrome (44933944).

The spelling of 21821132 in words is "twenty-one million, eight hundred twenty-one thousand, one hundred thirty-two".

Divisors: 1 2 4 17 34 68 320899 641798 1283596 5455283 10910566 21821132