Search a number
-
+
21889642 = 2175231231
BaseRepresentation
bin101001110000…
…0001001101010
31112012002221111
41103200021222
521100432032
62101100534
7354026125
oct123401152
945162844
1021889642
11113a1015
1273b774a
1346c5568
142c9b3bc
151dc5c47
hex14e026a

21889642 has 16 divisors (see below), whose sum is σ = 34860672. Its totient is φ = 10272960.

The previous prime is 21889601. The next prime is 21889643. The reversal of 21889642 is 24698812.

It is a junction number, because it is equal to n+sod(n) for n = 21889595 and 21889604.

It is not an unprimeable number, because it can be changed into a prime (21889643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17167 + ... + 18397.

It is an arithmetic number, because the mean of its divisors is an integer number (2178792).

It is a vampire number, since it can be written as 24628891 (with its own digits).

Almost surely, 221889642 is an apocalyptic number.

21889642 is a deficient number, since it is larger than the sum of its proper divisors (12971030).

21889642 is a wasteful number, since it uses less digits than its factorization.

21889642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773.

The product of its digits is 55296, while the sum is 40.

The square root of 21889642 is about 4678.6367672646. The cubic root of 21889642 is about 279.7346210070.

The spelling of 21889642 in words is "twenty-one million, eight hundred eighty-nine thousand, six hundred forty-two".

Divisors: 1 2 17 34 523 1046 1231 2462 8891 17782 20927 41854 643813 1287626 10944821 21889642