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21022012 = 22114143271
BaseRepresentation
bin101000000110…
…0010100111100
31110120000210001
41100030110330
520340201022
62030324044
7343453444
oct120142474
943500701
1021022012
1110959170
127059624
13448067b
142b13124
151ca3b27
hex140c53c

21022012 has 48 divisors (see below), whose sum is σ = 42223104. Its totient is φ = 9072000.

The previous prime is 21022009. The next prime is 21022021.

It can be divided in two parts, 2102 and 2012, that multiplied together give a palindrome (4229224).

21022012 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21022012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77437 + ... + 77707.

It is an arithmetic number, because the mean of its divisors is an integer number (879648).

Almost surely, 221022012 is an apocalyptic number.

21022012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21022012 is an abundant number, since it is smaller than the sum of its proper divisors (21201092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21022012 is a wasteful number, since it uses less digits than its factorization.

21022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21022012 is about 4584.9767720240. The cubic root of 21022012 is about 275.9887799122.

The spelling of 21022012 in words is "twenty-one million, twenty-two thousand, twelve".

Divisors: 1 2 4 11 22 41 43 44 82 86 164 172 271 451 473 542 902 946 1084 1763 1804 1892 2981 3526 5962 7052 11111 11653 11924 19393 22222 23306 38786 44444 46612 77572 122221 128183 244442 256366 477773 488884 512732 955546 1911092 5255503 10511006 21022012