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21551412 = 2231795951
BaseRepresentation
bin101001000110…
…1100100110100
31111112220222110
41102031210310
521004121122
62045531020
7351120051
oct122154464
944486873
1021551412
111118a993
127273a70
13460761c
142c10028
151d5a90c
hex148d934

21551412 has 12 divisors (see below), whose sum is σ = 50286656. Its totient is φ = 7183800.

The previous prime is 21551407. The next prime is 21551423. The reversal of 21551412 is 21415512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897964 + ... + 897987.

Almost surely, 221551412 is an apocalyptic number.

It is an amenable number.

21551412 is an abundant number, since it is smaller than the sum of its proper divisors (28735244).

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

21551412 is a wasteful number, since it uses less digits than its factorization.

21551412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795958 (or 1795956 counting only the distinct ones).

The product of its digits is 400, while the sum is 21.

The square root of 21551412 is about 4642.3498360205. The cubic root of 21551412 is about 278.2863533202.

Adding to 21551412 its reverse (21415512), we get a palindrome (42966924).

The spelling of 21551412 in words is "twenty-one million, five hundred fifty-one thousand, four hundred twelve".

Divisors: 1 2 3 4 6 12 1795951 3591902 5387853 7183804 10775706 21551412