Search a number
-
+
21020199 = 37006733
BaseRepresentation
bin101000000101…
…1111000100111
31110112221021220
41100023320213
520340121244
62030311423
7343445244
oct120137047
943487256
1021020199
1110957872
127058573
13447c8b5
142b125cb
151ca3319
hex140be27

21020199 has 4 divisors (see below), whose sum is σ = 28026936. Its totient is φ = 14013464.

The previous prime is 21020161. The next prime is 21020227. The reversal of 21020199 is 99102012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21020199 - 212 = 21016103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020119) 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, 3503364 + ... + 3503369.

It is an arithmetic number, because the mean of its divisors is an integer number (7006734).

Almost surely, 221020199 is an apocalyptic number.

21020199 is a deficient number, since it is larger than the sum of its proper divisors (7006737).

21020199 is an equidigital number, since it uses as much as digits as its factorization.

21020199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006736.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 21020199 is about 4584.7790568358. The cubic root of 21020199 is about 275.9808456567.

It can be divided in two parts, 2 and 1020199, that added together give a palindrome (1020201).

The spelling of 21020199 in words is "twenty-one million, twenty thousand, one hundred ninety-nine".

Divisors: 1 3 7006733 21020199