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21821374 = 2103105929
BaseRepresentation
bin101001100111…
…1011110111110
31112001122022001
41103033132332
521041240444
62055412514
7353323111
oct123173676
945048261
1021821374
11113547a3
12738413a
1346a0473
142c80578
151db08d4
hex14cf7be

21821374 has 8 divisors (see below), whose sum is σ = 33050160. Its totient is φ = 10804656.

The previous prime is 21821363. The next prime is 21821383. The reversal of 21821374 is 47312812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52759 + ... + 53170.

It is an arithmetic number, because the mean of its divisors is an integer number (4131270).

Almost surely, 221821374 is an apocalyptic number.

21821374 is a deficient number, since it is larger than the sum of its proper divisors (11228786).

21821374 is a wasteful number, since it uses less digits than its factorization.

21821374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106034.

The product of its digits is 2688, while the sum is 28.

The square root of 21821374 is about 4671.3353551206. The cubic root of 21821374 is about 279.4435120839.

The spelling of 21821374 in words is "twenty-one million, eight hundred twenty-one thousand, three hundred seventy-four".

Divisors: 1 2 103 206 105929 211858 10910687 21821374