Base | Representation |
---|---|
bin | 10011111101010110… |
… | …101001100000010001 |
3 | 2001022112011020210010 |
4 | 103331112221200101 |
5 | 322342143121001 |
6 | 13502304425133 |
7 | 1356031515513 |
oct | 237526514021 |
9 | 61275136703 |
10 | 21430442001 |
11 | 90a7a202a1 |
12 | 41a10181a9 |
13 | 2036b54617 |
14 | 107427dbb3 |
15 | 8566258d6 |
hex | 4fd5a9811 |
21430442001 has 4 divisors (see below), whose sum is σ = 28573922672. Its totient is φ = 14286961332.
The previous prime is 21430441979. The next prime is 21430442009. The reversal of 21430442001 is 10024403412.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is not a de Polignac number, because 21430442001 - 215 = 21430409233 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (21430442009) by changing a digit.
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, 3571740331 + ... + 3571740336.
It is an arithmetic number, because the mean of its divisors is an integer number (7143480668).
Almost surely, 221430442001 is an apocalyptic number.
It is an amenable number.
21430442001 is a deficient number, since it is larger than the sum of its proper divisors (7143480671).
21430442001 is an equidigital number, since it uses as much as digits as its factorization.
21430442001 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7143480670.
The product of its (nonzero) digits is 768, while the sum is 21.
Adding to 21430442001 its reverse (10024403412), we get a palindrome (31454845413).
The spelling of 21430442001 in words is "twenty-one billion, four hundred thirty million, four hundred forty-two thousand, one".
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