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22010221 = 107205703
BaseRepresentation
bin101001111110…
…1100101101101
31112102020100101
41103331211231
521113311341
62103431101
7355040512
oct123754555
945366311
1022010221
1111473672
127455491
1347383cc
142ccd309
151deb831
hex14fd96d

22010221 has 4 divisors (see below), whose sum is σ = 22216032. Its totient is φ = 21804412.

The previous prime is 22010201. The next prime is 22010231. The reversal of 22010221 is 12201022.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12201022 = 26100511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-22010221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22010198 and 22010207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22010201) 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, 102745 + ... + 102958.

It is an arithmetic number, because the mean of its divisors is an integer number (5554008).

Almost surely, 222010221 is an apocalyptic number.

It is an amenable number.

22010221 is a deficient number, since it is larger than the sum of its proper divisors (205811).

22010221 is a wasteful number, since it uses less digits than its factorization.

22010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205810.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 22010221 is about 4691.5051955636. The cubic root of 22010221 is about 280.2473197472.

Adding to 22010221 its reverse (12201022), we get a palindrome (34211243).

The spelling of 22010221 in words is "twenty-two million, ten thousand, two hundred twenty-one".

Divisors: 1 107 205703 22010221