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10020221 = 42123801
BaseRepresentation
bin100110001110…
…010101111101
3200212002011022
4212032111331
510031121341
6554433525
7151112321
oct46162575
920762138
1010020221
115724382
1234328a5
1320cab33
14148b981
15d2de4b
hex98e57d

10020221 has 4 divisors (see below), whose sum is σ = 10044444. Its totient is φ = 9996000.

The previous prime is 10020193. The next prime is 10020253. The reversal of 10020221 is 12202001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12202001 = 71743143.

It can be written as a sum of positive squares in 2 ways, for example, as 2805625 + 7214596 = 1675^2 + 2686^2 .

It is a cyclic number.

It is not a de Polignac number, because 10020221 - 210 = 10019197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10020199 and 10020208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020271) 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, 11480 + ... + 12321.

It is an arithmetic number, because the mean of its divisors is an integer number (2511111).

Almost surely, 210020221 is an apocalyptic number.

It is an amenable number.

10020221 is a deficient number, since it is larger than the sum of its proper divisors (24223).

10020221 is an equidigital number, since it uses as much as digits as its factorization.

10020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24222.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 10020221 is about 3165.4732663537. The cubic root of 10020221 is about 215.5885873121.

Adding to 10020221 its reverse (12202001), we get a palindrome (22222222).

The spelling of 10020221 in words is "ten million, twenty thousand, two hundred twenty-one".

Divisors: 1 421 23801 10020221