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21313312 = 25666041
BaseRepresentation
bin101000101001…
…1011100100000
31111002211100221
41101103130200
520424011222
62040452424
7346105636
oct121233440
944084327
1021313312
1111038009
12717a114
134553137
142b8b356
151d100c7
hex1453720

21313312 has 12 divisors (see below), whose sum is σ = 41960646. Its totient is φ = 10656640.

The previous prime is 21313301. The next prime is 21313333. The reversal of 21313312 is 21331312.

It can be written as a sum of positive squares in only one way, i.e., 21123216 + 190096 = 4596^2 + 436^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332989 + ... + 333052.

Almost surely, 221313312 is an apocalyptic number.

It is an amenable number.

21313312 is a deficient number, since it is larger than the sum of its proper divisors (20647334).

21313312 is an equidigital number, since it uses as much as digits as its factorization.

21313312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666051 (or 666043 counting only the distinct ones).

The product of its digits is 108, while the sum is 16.

The square root of 21313312 is about 4616.6342718478. The cubic root of 21313312 is about 277.2577199764.

Adding to 21313312 its reverse (21331312), we get a palindrome (42644624).

The spelling of 21313312 in words is "twenty-one million, three hundred thirteen thousand, three hundred twelve".

Divisors: 1 2 4 8 16 32 666041 1332082 2664164 5328328 10656656 21313312