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21206442 = 233534407
BaseRepresentation
bin101000011100…
…1010110101010
31110220101202210
41100321112222
520412101232
62034305550
7345152235
oct120712652
943811683
1021206442
1110a74794
1271282b6
1345165ba
142b6041c
151cdd5cc
hex14395aa

21206442 has 8 divisors (see below), whose sum is σ = 42412896. Its totient is φ = 7068812.

The previous prime is 21206441. The next prime is 21206443. The reversal of 21206442 is 24460212.

It is an interprime number because it is at equal distance from previous prime (21206441) and next prime (21206443).

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

21206442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21206441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1767198 + ... + 1767209.

It is an arithmetic number, because the mean of its divisors is an integer number (5301612).

Almost surely, 221206442 is an apocalyptic number.

21206442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21206442 is a wasteful number, since it uses less digits than its factorization.

21206442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3534412.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 21206442 is about 4605.0452766504. The cubic root of 21206442 is about 276.7935312760.

Adding to 21206442 its reverse (24460212), we get a palindrome (45666654).

The spelling of 21206442 in words is "twenty-one million, two hundred six thousand, four hundred forty-two".

Divisors: 1 2 3 6 3534407 7068814 10603221 21206442