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21102122 = 2195091091
BaseRepresentation
bin101000001111…
…1111000101010
31110201002200002
41100133320222
520400231442
62032143002
7344236136
oct120377052
943632602
1021102122
1110a03378
127097a62
1344aac82
142b343c6
151cbc732
hex141fe2a

21102122 has 16 divisors (see below), whose sum is σ = 33415200. Its totient is φ = 9966960.

The previous prime is 21102113. The next prime is 21102161. The reversal of 21102122 is 22120112.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18797 + ... + 19887.

It is an arithmetic number, because the mean of its divisors is an integer number (2088450).

Almost surely, 221102122 is an apocalyptic number.

21102122 is a deficient number, since it is larger than the sum of its proper divisors (12313078).

21102122 is a wasteful number, since it uses less digits than its factorization.

21102122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21102122 is about 4593.7046052179. The cubic root of 21102122 is about 276.3389118880.

Adding to 21102122 its reverse (22120112), we get a palindrome (43222234).

The spelling of 21102122 in words is "twenty-one million, one hundred two thousand, one hundred twenty-two".

Divisors: 1 2 19 38 509 1018 1091 2182 9671 19342 20729 41458 555319 1110638 10551061 21102122