Base | Representation |
---|---|
bin | 11101011010001100111… |
… | …111010000010011100101 |
3 | 21011012112222002110102211 |
4 | 131122030333100103211 |
5 | 231103002001134341 |
6 | 4144233512203421 |
7 | 266004156511516 |
oct | 35321477202345 |
9 | 7135488073384 |
10 | 2021000021221 |
11 | 70a112908625 |
12 | 287824999571 |
13 | 11876c185a2c |
14 | 6db618caa0d |
15 | 37886931181 |
hex | 1d68cfd04e5 |
2021000021221 has 2 divisors, whose sum is σ = 2021000021222. Its totient is φ = 2021000021220.
The previous prime is 2021000021219. The next prime is 2021000021267. The reversal of 2021000021221 is 1221200001202.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 1117196150625 + 903803870596 = 1056975^2 + 950686^2 .
It is a cyclic number.
It is not a de Polignac number, because 2021000021221 - 21 = 2021000021219 is a prime.
Together with 2021000021219, it forms a pair of twin primes.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2021000021321) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010500010610 + 1010500010611.
It is an arithmetic number, because the mean of its divisors is an integer number (1010500010611).
Almost surely, 22021000021221 is an apocalyptic number.
It is an amenable number.
2021000021221 is a deficient number, since it is larger than the sum of its proper divisors (1).
2021000021221 is an equidigital number, since it uses as much as digits as its factorization.
2021000021221 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 32, while the sum is 13.
Adding to 2021000021221 its reverse (1221200001202), we get a palindrome (3242200022423).
The spelling of 2021000021221 in words is "two trillion, twenty-one billion, twenty-one thousand, two hundred twenty-one".
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