Base | Representation |
---|---|
bin | 100110100011… |
… | …0100100110101 |
3 | 1102000212200101 |
4 | 1031012210311 |
5 | 20133241041 |
6 | 2001114101 |
7 | 333541114 |
oct | 115064465 |
9 | 42025611 |
10 | 20212021 |
11 | 10455655 |
12 | 6928931 |
13 | 4258a9b |
14 | 2981c7b |
15 | 1b93b31 |
hex | 1346935 |
20212021 has 16 divisors (see below), whose sum is σ = 21567744. Its totient is φ = 18918144.
The previous prime is 20212013. The next prime is 20212033. The reversal of 20212021 is 12021202.
It is a cyclic number.
It is not a de Polignac number, because 20212021 - 23 = 20212013 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 20211989 and 20212007.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20212001) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147465 + ... + 147601.
It is an arithmetic number, because the mean of its divisors is an integer number (1347984).
Almost surely, 220212021 is an apocalyptic number.
It is an amenable number.
20212021 is a deficient number, since it is larger than the sum of its proper divisors (1355723).
20212021 is a wasteful number, since it uses less digits than its factorization.
20212021 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 300.
The product of its (nonzero) digits is 16, while the sum is 10.
The square root of 20212021 is about 4495.7781306466. The cubic root of 20212021 is about 272.3975812398.
Adding to 20212021 its reverse (12021202), we get a palindrome (32233223).
It can be divided in two parts, 202 and 12021, that multiplied together give a palindrome (2428242).
The spelling of 20212021 in words is "twenty million, two hundred twelve thousand, twenty-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.073 sec. • engine limits •