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21022101 = 322335789
BaseRepresentation
bin101000000110…
…0010110010101
31110120000220100
41100030112111
520340201401
62030324313
7343453632
oct120142625
943500810
1021022101
1110959241
127059699
134480719
142b13189
151ca3b86
hex140c595

21022101 has 6 divisors (see below), whose sum is σ = 30365270. Its totient is φ = 14014728.

The previous prime is 21022097. The next prime is 21022103. The reversal of 21022101 is 10122012.

It can be written as a sum of positive squares in only one way, i.e., 18922500 + 2099601 = 4350^2 + 1449^2 .

It is not a de Polignac number, because 21022101 - 22 = 21022097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2335789 = 21022101 / (2 + 1 + 0 + 2 + 2 + 1 + 0 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167886 + ... + 1167903.

Almost surely, 221022101 is an apocalyptic number.

It is an amenable number.

21022101 is a deficient number, since it is larger than the sum of its proper divisors (9343169).

21022101 is a wasteful number, since it uses less digits than its factorization.

21022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335795 (or 2335792 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 21022101 is about 4584.9864776246. The cubic root of 21022101 is about 275.9891693923.

Adding to 21022101 its reverse (10122012), we get a palindrome (31144113).

The spelling of 21022101 in words is "twenty-one million, twenty-two thousand, one hundred one".

Divisors: 1 3 9 2335789 7007367 21022101